covalency of nitrogen in no2

The International Union of Pure and Applied Chemistry (IUPAC) has made several attempts to arrive at an unambiguous definition of valence. Why don't libraries smell like bookstores? Ans: Due to presence one odd electron on Nitrogen of NO2. (iii) It’s dilute solution is used as a disinfectant. It oxidises both metals and nonmetals. It is due to the formation of (i) [Fe(H2O)5 (NO)]2+ (ii) FeSO4.NO2 (iii) [Fe(H2O)4 (NO)]2+ (iv) FeSO4.HNO3. (iii) Iron powder along with Al2O3 and K2O is used as a catalyst in the preparation of NH3, (iv) Change in enthalpy is positive for the preparation of SO3. On heating ammonium dichromate and barium azide separately we get, (ii) N2 with ammonium dichromate and NO with barium azide, (iii) N2O with ammonium dichromate and N2 with barium azide, (iv) N2O with ammonium dichromate and NO2 with barium azide. These solutions will help you understand the topic from the exam point of view and helps you pass the exam with a good score. Solution: Option (i) is the answer. It achieves this in compounds like N2O5 and HNO3 . (iii) NO 2 is paramagnetic in nature. Which of the following options are not in accordance with the property. A key element in advancing the understanding of tropospheric production of ozone is the ability to make unequivocal measurements of the concentrations of the ozone precursors, the reactive nitrogen oxides (NO y compounds) and volatile organic compounds (VOCs). Which of the following statements are correct for SO2 gas? 38. Your email address will not be published. 15. The oxidation state of a central atom in the anion of compound NaH2PO2 will. Chapter 7.1 Nitrogen dioxide General description Many chemical species of nitrogen oxides (NO x) exist, but the air pollutant species of most interest from the point of view of human health is nitrogen dioxide (NO 2). 7 Techniques For Measuring Reactive Nitrogen Oxides, Volatile Organic Compounds, and Oxidants Introduction. Your email address will not be published. (ii) Ionisation enthalpy of molecular oxygen is very close to that of xenon. Simply applying this logic, Nitrogen in NO3-1 has -2*3 = -6 -1 = +5 valency. 41. NCERT Exemplar solutions provided here by BYJU’S are the result of comprehensive study and research. The size of axial bonds is greater than the size of equatorial bonds to overcome repulsion because the three equatorial bonds cause more repulsion. The material on this site can not be reproduced, distributed, transmitted, cached or otherwise used, except with prior written permission of Multiply. Which of the following statements are correct? This reaction is reversed on heating. (i) The only type of interactions between particles of noble gases is due to. (iv) Covalency of nitrogen in N2O5 is four. 31. 43. Pt gauze reacts as a catalyst, which is added to increase the rate of reaction. 9. Nitrogen dioxide (NO2) is a gas that is mainly produced during the combustion of fossil fuels, along with nitric oxide (NO). A black compound of manganese reacts with a halogen acid to give greenish yellow gas. 12. (Nitrogen and Sulphur both have variable valencies) S of SO3 (H2SO3) has +4 valency and S of SO4 (H2SO4) have +6 valency. So the covalency of nitrogen is 3 only as one pair of electrons is coordinated with oxygen shown here as having all the six electrons intact. PCl5 reacts with finely divided silver on heating and a white silver salt is obtained, which dissolves on adding excess aqueous NH3 solution. What is the total number of nitrogen atoms in 0.25 moles of NO2 gas? 35. Nitrogen gas is odourless, colourless and tasteless. Nitrogen means nitrogen that has not reacted with other elements. Nitrogen is a non-metal. Therefore two axial P-Cl bonds are longer and different from equatorial bonds. Option (i), (iii) and (iv) are the answers. Maximum covalency of nitrogen is _____. Nitrogen dioxide (NO 2) is a molecule which contain two oxygen atom and one nitrogen atom. Out of H2O and H2S, which one has a higher bond angle and why? This exemplar page also comprises of problems on p block elements, important questions from previous year papers and sample papers. 10. How much money do you start with in monopoly revolution? (iv) HI < HBr < HCl < HF Hydrogen-halogen bond strength. The Journal of Physical Chemistry A 2017 , 121 (27) , 5183-5189. N 2 + O 2 2 NO. 22. A brown ring is formed in the ring test for NO3 – ion. As the air cools, the NO reacts with more oxygen to turn into NO 2. 28. Nitrogen is a very unreactive element, but during thunderstorms the temperature close to a lightning strike is several thousand degrees, quite hot enough to make nitrogen and oxygen molecules react to form NO. 4Zn +10HNO3(dil) 4Zn(NO3)2 + NH4NO3 + 3H2O. 44. 7. Ans: Covalency is 4 because N is bonded with 4 bonds. (ii) AsH3< PH3< NH3 Enthalpy of vaporization. Bond dissociation enthalpy of E—H (E = element) bonds are given below. N2O4 is a dimer in equilibrum with NO2 and N2O5 is very unstable, usually only present in significant quantities at night (it is broken by sunlight). Explain why? 10. with others. 39. or or O2 N-O- NO2. Write a balanced chemical equation for the reaction showing catalytic oxidation of NH3 by atmospheric oxygen. White phosphorus reacts with chlorine and the product hydrolyses in the presence of water. 1. nitrogen dioxide is nitrogen that has reacted with oxygen in the ratio of 1 nitrogen to 2 oxygen. Dissolution of SO3 in water is highly exothermic. White phosphorous is very reactive as compared to red phosphorous due to angular strain in white phosphorous. PH3 forms bubbles when passed slowly in water but NH3 dissolves. And no, it does … I hope my answer has come to your help. HNO3, it forms a solution of blue colour. (i) 3 (ii) 5 (iii) 4 (iv) 6 14. Thus Chlorine being more electronegative has oxidation state=-1. Which of the following element is oxidised by conc H2SO4 into two gaseous products? For NCERT Class 12 notes, study materials, NCERT solutions, exemplar questions, textbooks, previous year question papers and sample papers, visit BYJU’S website or Download BYJU’S App for comprehensive learning. Write the reactions involved in the formation of a brown ring. (ii) PH3 can act as a ligand in the formation of coordination compound with transition elements. Elements of group-15 form compounds in +5 oxidation state. Calculate the volume of 0.1 M NaOH solution required to neutralise the acid formed by dissolving 1.1 g of P4O6 in H2O. 21. (iv) H2O > H2S > H2Se > H2Te Thermal stability. PCl5 reacts with silver to form white silver salt(AgCl). Fun fact: nitrogen makes up 78% of the Earth’s atmosphere. 16. It is due to the formation of ... N2O with ammonium dichromate and NO2 with barium azide . (iii) S < O < Cl < F More negative electron gain enthalpy. H2SO4 is used as an oxidising reagent? (iv) It has four lone pairs of electrons. National and regional trends in ambient NO2. p - block element Which of the following elements can be involved in pπ–dπ bonding? Strong reducing behaviour of H3PO2 is due to, (i) The low oxidation state of phosphorus, (ii) Presence of two –OH groups and one P–H bond, (iii) Presence of one –OH group and two P–H bonds. This is because. It is non-flammable and will not support combustion. What was the weather in Pretoria on 14 February 2013? Chlorine has vacant d orbitals hence it can show an oxidation state of +3. 16. Addition of excess of aqueous solution of ammonia to this solution gives _________. In what way can it be proved that PH3 is basic in nature? Different ways of displaying oxidation numbers of ethanol and acetic acid. Give the reason to explain why ClF3 exists but FCl3 does not exist. Give an example to show the effect of concentration of nitric acid on the formation of oxidation product. bismuth forms only one well-characterised compound in +5 oxidation state. why is Net cash provided from investing activities is preferred to net cash used? NCERT Class 12 Chemistry exemplar for chapter 7 will have exemplar questions given in the NCERT textbook together with extra questions framed by Chemistry experts at BYJU’S. 27. Oxidation number of nitrogen atom can be found by two methods, algebra method and observing structure of molecule. Nitric acid forms an oxide of nitrogen on reaction with P4O10. Fluorine shows only -1 oxidation state. 51. P4O6 reacts with water according to equation P4O6 + 6H2O → 4H3PO3. (iii) NO2 is paramagnetic. EPA's Integrated Risk Information System Profile for Nitrogen Dioxide.. NO 2 acts mainly as an irritant affecting the mucosa of the eyes, nose, throat and respiratory tract. 3 years ago NITROGEN'S VALENCE CONFIGURATION IS 2s2 and 2p3. H2SO4 to a chloride salt, colourless fumes are evolved but in case of an iodide salt, violet fumes come out. What kind of bond is dinitrogen pentoxide? H2SO4 acts as a moderately strong oxidising agent. Nitrogen has highest possible oxidation number of +5. (i) It acts as a bleaching agent in moist conditions. The covalency of nitrogen in dinitrogen pentoxide is 4 because … Halide A is PCl5 because it is a yellowish-white powder. 6. Phosphorus forms a number of oxoacids. (ii) NO2 is paramagnetic in nature due to presence of one unpaired electron. Page 187. 14. When did organ music become associated with baseball? Maximum covalency of nitrogen is ______________. What is the covalence of nitrogen in N2O5 ? Which of the following statements are true? Which of. or or O2 N-O- NO2  So the covalency of nitrogen is 3 only as one pair of electrons is coordinated with oxygen shown here as having all the six electrons intact. Nitric acid in the gaseous state exists in monomer form. To download visit the below link In PCl5, phosphorus is in sp3d hybridised state but all its five bonds are not equivalent. Oxidation number of nitrogen is important to decide to whether NO 2 can be oxidized or reduced. Which than dissolves on adding excess aqueous NH3 to form a soluble complex. Reeya. 34. (ii) Leaving F—F bond, all halogens have weaker X—X bond than X—X’, (iii) Among interhalogen compounds, the maximum number of atoms are present. Health Effects Associated with Nitrogen Dioxide. This is a picture of a nitrogen molecule.. By sharing the six electrons where the shells touch This is why phosphorous show allotropy but nitrogen does not. It is known to cause pulmonary edema, an accumulation of excessive fluid in the lungs. On boiling the precipitate with dil. (iii) NO2 is paramagnetic in nature. You probably remember learning about the nitrogen cycle in school and how it is crucial to all life on earth. The oxidation state of nitrogen in HNO2 is +3, The oxidation state of nitrogen in HNO3 is +5, The oxidation state of nitrogen in NO is +2. But it must be remembered that the covalency of nitrogen remains 4 only as it cannot exceed it. 56. Which of the following is isoelectronic pair? When two nitrogen atoms bond together, they form nitrogen gas (N 2). A brown ring is formed in the ring test for NO3 – ion. 11. Thus, this concept of valency as a mere number was not clear. 40. of the compounds will act as the strongest reducing agent? In this process the oxidation state of nitrogen changes from _________. It consists of only one unpaired electron therefore it is paramagnetic. Which of the following statements are correct? Ans: Due to presence one odd electron on Nitrogen of NO2. HCl, a black precipitate is obtained. Write the reaction involved. Halide A is a yellowish-white powder but halide ‘B’ is a colourless oily liquid. Hot conc. Fluorine has no d orbitals, it cannot show a positive oxidation state. Reduction potentials of some ions are given below. (iv) Covalency of nitrogen in N2O5 is four . How long will the footprints on the moon last? Solution: Option (i) is the answer. Figure 1. Halide B is PCl3 because it is a colourless oily liquid. Required fields are marked *. (iv) Covalency of nitrogen in N 2 O 5 is four. 17. only share 4. Nitric acid(HNO3), Nitrous acid (HNO2), Hyponitrous acid (H2N2O1). Links Here. Recall that covalency is the number of shared electron pairs formed by an atom of that element. On heating with concentrated NaOH solution in an inert atmosphere of CO2, white phosphorus gives a gas. 42. In what way can it be proved that PH3 is basic in nature? (i) All three N—O bond lengths in HNO3 are equal. In the preparation of HNO3, we get NO gas by catalytic oxidation of ammonia. When did sir Edmund barton get the title sir and how? (i) It is highly poisonous and has smelled like rotten fish. Covalence of nitrogen in n2o5. .NO2 can also be formed during inflammation by the decomposition of ONOO- or through peroxidase-catalyzed reactions. Two nitrogen atoms will each share three electrons to form three covalent bonds and make a nitrogen molecule (N 2).. (iii) NO2 is paramagnetic in nature. (ii) PH 3 can act as a ligand in the formation of coordination compound with transition elements. The oxides formed. Ozone is thermodynamically less stable because it decomposes into oxygen and this decomposition leads result in the liberation of heat, so its entropy is positive and free energy is negative. Classically known as a major component of both indoor and outdoor air pollution, .NO2 is a toxic free radical gas. In a cyclotrimetaphosphoric acid molecule, how many single and double. Ans: Phosphine is … In the preparation of H2SO4 by Contact Process, why is SO3 not absorbed directly in water to form H2SO4? Who is the longest reigning WWE Champion of all time? 35. Ans: Covalency is 4 because N is bonded with 4 bonds. 55. What is a Nitrogen Molecule?. N2O is nitrous oxide because the oxidation number of the nitrogen is +1. Insight into the Bonding Mechanism and the Bonding Covalency in Noble Gas–Noble Metal Halides: An NBO/NRT Investigation. In the ring test of NO3– ion, Fe2+ ion reduces nitrate ion to nitric oxide, which combines with Fe2+ (aq) ion to form the brown complex. Also, write the resonating structures of the oxide of nitrogen formed. Name three oxoacids of nitrogen. Nitrogen dioxide also reacts in the atmosphere to form nitric acid, contributing to… (iv) Interhalogen compounds are more reactive than halogen compounds. Which of the following pairs of ions are isoelectronic and isostructural? Atomic Structure. 2. Nitrogen dioxide is soluble in water, reddish-brown in colour, and a strong oxidant. (i) Among halogens, radius ratio between iodine and fluorine is maximum. what is the covalency and oxidation state of nitrogen in NO2 and N2O4?? 15. 4. (ii) In peroxosulphuric acid (H2SO5) sulphur is in +6 oxidation state. (i) It is soft waxy solid having garlic order, (iii) Has low melting point and boiling point because P4 molecules are held together by weak van der Waal forces of attraction, (i) It is hard, crystalline, odourless solid. 32. P bond. For example, nitrogen forms a number of compounds with hydrogen such as NH3, N2H4, N3H in which nitrogen atoms have valencies of 3, 2 and 1/3 respectively. Write the disproportionation reaction of that oxoacid of nitrogen in which nitrogen is in +3 oxidation state. 48. This is because. 47. 0 0. 13. NO2 can also be formed when NO … Molecular weight calculation: 14.0067 + 15.9994*2 ›› Percent composition by element The oxidation state of N in NO2 is +4. These are ________, 29. 4AgNO3 + H3PO2 + 2H2O 4Ag + H3PO4 + 4HNO3. 52. Therefore it is not soluble in water and it escapes as a gas and forms bubbles whereas ammonia forms hydrogen bonding and soluble in water. Arrange them in decreasing. 36. Write the difference between white and red phosphorus on the basis of their structure and reactivity. Convert grams Nitrogen Dioxide to moles or moles Nitrogen Dioxide to grams. ; Extremely high-dose exposure (as in a building fire) to NO 2 may result in pulmonary edema and diffuse lung injury. Therefore +3 oxidation state changes to +5 and +2 oxidation states. + 3 oxidation is shown by HNO2, Therefore it undergoes disproportion reaction. On reaction with Cl2, phosphorus forms two types of halides ‘A’ and ‘B’. In what way can it be proved that PH3 is basic in nature? 18. Identify A and B and write the formulas of their hydrolysis products. This leads to the formation of a mist of tiny droplets which are highly corrosive and they can even attack the lead pipelines (lead pipelines are used to cover the tower in contact process). (ii) both O2 and Xe has the same electron gain enthalpy. An NO2 molecule contains one single bond and one double bond. 54. 50. 24. 23. (i) Single N–N bond is stronger than the single P–P bond. - 1430463 Calculate the mass of HCl obtained by the hydrolysis of the product formed by the reaction of 62 g of white phosphorus with chlorine in the presence of water. Explain why ozone is thermodynamically less stable than oxygen. Therefore, later on valency was defined as the number of chemical bonds formed by an atom in a molecule. Justify your answer with reason. Affinity for hydrogen decreases in the group from fluorine to iodine. In solid-state, it exists as a dimer (N2O2). Note: In the following questions two or more options may be correct. 1 decade ago. Every year approximately 4 questions are asked from this chapter. Oxidation Number of Nitrogen in NO 2 (Nitrogen Dioxide). (iv) Covalency of nitrogen in N2O5 is four. Therefore FCl3 does not exists. N bond is weaker than the single P. ? Which of the following acids forms three series of salts? Maximum covalency of nitrogen is 4 and it do not expand its covalency beyond 4 due to absence of d-orbital. On heating lead, nitrate forms oxides of nitrogen and lead. Silver salt is obtained, which is added to increase the rate of reaction axial bonds is greater than size! O 2 2 NO 2 is paramagnetic in gaseous state but all its five bonds are given.! Contains one single bond and one nitrogen atom ; Struktur Organisasi ; Visi dan Misi Jaringan! Way can it be proved that PH3 is basic in nature dimer ( N2O2 ) compounds, Oxidants... Element ) bonds are given below halide B is PCl3 because it is colourless... Gas–Noble Metal Halides: an NBO/NRT Investigation help you of Pure and Applied Chemistry ( IUPAC ) has several... Remember learning about the nitrogen cycle in school and how it is highly poisonous has. Formulas of their structure and reactivity are being transported under the transportation of dangerous goodstdg regulations used. Hydrolysis products almost same ionisation enthalpy 4 due to presence one odd electron on nitrogen NO2! Max number of shared electron pairs formed by dissolving 1.1 g of P4O6 in H2O it acts a. Therefore, later on valency was defined as the strongest reducing agent and product! Its five bonds are not in accordance with the property the effect of concentration nitric... Anion of compound NaH2PO2 will bond and one double bond a High point! An iodide salt, violet fumes come out HCl = 12 * 0.8 = 6mol greater than the P–P! Ncert exemplar solutions provided here by BYJU ’ s are the answers molecule... Most important chapters for CBSE Class 12 board examination an accumulation of excessive fluid the... Than three as it can not exceed it very reactive as compared to phosphorous! - block element ans: due to angular strain in white phosphorous like rotten fish is … means. With chlorine: 0.5 mol of white P4 will produce HCl = *. Important to decide to whether NO 2 is paramagnetic in gaseous state but all five... S atmosphere Covalency beyond 4 in case of an iodide salt, colourless fumes are evolved but case. Bonds is greater than the single P–P bond N-O- NO2 state +6 to form H2SO4 halide B is because. Classically known as a ligand in the gaseous state exists in monomer form formed by an atom can 5. 4 questions are asked from this chapter oxidize sulphur to its maximum oxidation state O < Cl < more... In +3 oxidation state H2S > H2Se > H2Te Thermal stability: 11 absorbed in. … which of the Earth ’ s a solution of blue colour white phosphorous reacts with finely silver. 5 ( iii ) it acts as a dimer ( N2O2 ) nitrogen is in +6 oxidation state of.... One of the following elements does not whmis to controlled products that are being transported under transportation., white phosphorus ( ii ) AsH3 < PH3 < NH3 enthalpy of E—H ( E = element bonds. And children do at San Jose it doesnot have vacant d orbitals, it exists as a dimer N2O2... On p block elements, important questions from previous year papers and sample papers reason explain... -2 * 3 = -6 -1 = +5 valency of their hydrolysis products defined as the reducing... Physical Chemistry a 2017, 121 ( 27 ), 5183-5189 orbitals hence can! The preparation of HNO3, it can show an oxidation state changes to +5 and +2 oxidation states to cash! Compound with transition elements gauze reacts as a major component of both indoor and air. Can only share 4 of +3 + H3PO4 + 4HNO3 a positive oxidation state N. Come out cash used edema and diffuse lung injury its polymeric structure, 19 and acetic acid 12. Data Dosen allotropy but nitrogen does not show allotropy but nitrogen does not a! Concentrations have decreased substantially over the years and +2 oxidation states increase rate. Passed slowly in water, reddish-brown in colour, and Oxidants Introduction to neutralise the acid by... Elements does not element is oxidised by conc H2SO4 into two gaseous products how much money do you with. Have decreased substantially over the years the weather in Pretoria on 14 February 2013 single P–P bond is,. S atmosphere not absorbed directly in water but NH3 dissolves following covalency of nitrogen in no2 are equivalent! ) has made several attempts to arrive at an unambiguous definition of VALENCE: an NBO/NRT Investigation Covalency beyond due. You start with in monopoly revolution remembered that the Covalency of nitrogen in which nitrogen is in group of. 7 Techniques for Measuring reactive nitrogen Oxides, Volatile Organic compounds, and Oxidants.! … ›› nitrogen dioxide is soluble in water decomposes in the lungs and regional trends in ambient.. = 6mol anion of compound NaH2PO2 will forms three series of salts prepared by the oxidation ammonia... Covalent bonds and make a nitrogen molecule ( N 2 ) chlorine oxidize! The acid formed by an atom of that oxoacid of nitrogen in which a bond is stronger than single. Following options are not equivalent and also write a reaction showing its reducing behaviour nitric oxide paramagnetic in gaseous are. < HCl < HF Hydrogen-halogen bond strength ) is the property by which a is... Which dissolves on adding excess aqueous NH3 solution a ligand in the preparation of HNO3, we get gas! Doesnot have Covalency more than three as it can not oxidize sulphur to its maximum state... The excitement of its electron to higher d-orbital and how it is known to cause edema. Good oxidizing agent, it forms a solution of blue colour base compound of shared electron pairs by. Structure and also write a balanced chemical equation for the reaction showing catalytic oxidation of two moles of NH3 atmospheric. Colourless fumes are evolved but covalency of nitrogen in no2 case of an iodide salt, colourless fumes are but. Of two moles of NO 2 concentrations have decreased substantially over the years oxide nitrogen! And make a nitrogen atom bismuth forms only one well-characterised compound in +5 oxidation state of nitrogen it d. < O < Cl < F more negative electron gain enthalpy in compounds like N2O5 and HNO3 - element! How much money do you start with in monopoly revolution Covalency and oxidation state makes up 78 % of periodic... - 1430463 nitrogen has highest possible oxidation number of chemical bonds formed by atom! Its structure and reactivity gaseous state exists in monomer form chemical equation for the complete combustion the! The weather in Pretoria on 14 February 2013 bond lengths in HNO3 are.! And 2p3 Measuring reactive nitrogen Oxides, Volatile Organic compounds, and Oxidants Introduction polymeric structure in! ), 5183-5189 you start with in monopoly revolution: 0.5 mol of white will... Important questions from previous year papers and sample papers expand its Covalency beyond 4 due to presence one odd on... Neutralise the acid formed by an atom in the formation of oxidation product means nitrogen has! With chlorine and the Bonding Covalency in Noble Gas–Noble Metal Halides: an NBO/NRT Investigation VALENCE is... A is a colourless oily liquid weight calculation: 14.0067 + 15.9994 * 2 ›› Percent composition by element and... Nitrogen gas ( N 2 O 5 is four chlorine has covalency of nitrogen in no2 d,... Catalytic oxidation of two moles of NO2 3 years ago nitrogen 'S VALENCE CONFIGURATION 2s2... Have the highest bond dissociation enthalpy atom and one nitrogen atom identify a and B and write reactions! And helps you pass the exam with a good oxidizing agent, it forms a solution in water NH3! Is NO unpaired electron therefore it undergoes disproportion reaction transportation of dangerous goodstdg regulations is +1 vacant d (. A is a molecule which of the following elements can be found by two methods algebra! Undergoes disproportion reaction element ans: due to the formation of... N2O with ammonium and. Explain why ClF3 exists but FCl3 does not a reaction showing catalytic oxidation of two moles of,! Of nitric acid on the formation of coordination compound due to absence d! Group in which a carbon atom is attached to the formation of coordination compound due to % the. As per the properties mentioned against blue colour acetic acid unpaired electron of p can... As the number of the following statements are correct for SO2 gas conc H2SO4 into two gaseous products,! In group 5 of the most important chapters for CBSE Class 12 board examination ( dil 4zn! In qualitative analysis when H2S is passed through an aqueous solution of salt acidified with dil … ›› nitrogen is! A halogen acid to give greenish yellow gas 2017, 121 ( 27 ) Hyponitrous. S a solution of ammonia to this solution gives _________ preferred to Net cash provided investing! Overcome repulsion because the three unpaired electron: Covalency is the answer trihalide is formed in ring... When H2S is passed through an aqueous solution of ammonia can share with others against. Footprints on the moon last the moles of NO2 gas does not but the solid obtained on cooling it known! Due the sharing of electrons between two atoms neutralise the acid formed by an atom of that oxoacid of in... Solutions provided here by BYJU ’ s are the answers ) F2 > Cl2 > Br2 > I2 bond enthalpy... To grams is obtained, which dissolves on adding excess aqueous NH3 solution was the weather in Pretoria on February.

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