NCERT Class 12 Chemistry exemplar for chapter 7 pdf will benefit the students on attempting the exercises given in the book for self-assessment and to master the basic techniques of problem-solving. How much money do you start with in monopoly revolution? H2SO4 acts as a moderately strong oxidising agent. Ans: Phosphine is … 20. Fluorine shows only -1 oxidation state. Which of the following statements is wrong? 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. Solution: Option (i) is the answer. (iii) P4 molecule in white phosphorus have angular strain therefore white, (iv) PCl is ionic in the solid-state in which cation is tetrahedral and the anion is, 34. On boiling the precipitate with dil. 24. When two nitrogen atoms bond together, they form nitrogen gas (N 2). Maximum covalency of nitrogen is 4 and it do not expand its covalency beyond 4 due to absence of d-orbital. Oxidation number of nitrogen atom can be found by two methods, algebra method and observing structure of molecule. Page 187. (iii) It’s dilute solution is used as a disinfectant. 4Zn +10HNO3(dil) 4Zn(NO3)2 + NH4NO3 + 3H2O. Hence it can form SCl4 but not SCl6. How long will the footprints on the moon last? 2. 51. Total Nitrogen (TN) is the sum of nitrate-nitrogen (NO3-N), nitrite-nitrogen (NO2-N), ammonia-nitrogen (NH3-N) and organically bonded nitrogen. 30. When did organ music become associated with baseball? Reduction potentials of some ions are given below. Phosphorus has three allotropic forms — (i) white phosphorus (ii) red phosphorus and (iii) black phosphorus. Write a balanced chemical equation for the reaction showing catalytic oxidation of NH3 by atmospheric oxygen. 33. 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. Which. (ii) PH3 can act as a ligand in the formation of coordination compound with transition elements. Write its structure and also write a reaction showing its reducing behaviour. A black compound of manganese reacts with a halogen acid to give greenish yellow gas. The oxidation state of N in NO2 is +4. To answer all the questions related to this chapter students are advised to solve the NCERT Exemplar Class 12 Chapter 7 the P block elements. When an excess of this gas reacts with NH3 an unstable trihalide is formed. For example, nitrogen has a maximum valence of 5, in forming ammonia two valencies are left unattached; sulfur has a maximum valence of 6, in forming hydrogen sulphide four valencies are left unattached. (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. Which of the following statements is wrong? (Nitrogen and Sulphur both have variable valencies) S of SO3 (H2SO3) has +4 valency and S of SO4 (H2SO4) have +6 valency. It is due to the formation of ... N2O with ammonium dichromate and NO2 with barium azide . Nitrogen gas is odourless, colourless and tasteless. Explain why ozone is thermodynamically less stable than oxygen. H2SO4 is used as an oxidising reagent? In what way can it be proved that PH3 is basic in nature? Every year approximately 4 questions are asked from this chapter. 10. 9. Calculate the volume of 0.1 M NaOH solution required to neutralise the acid formed by dissolving 1.1 g of P4O6 in H2O. Therefore, later on valency was defined as the number of chemical bonds formed by an atom in a molecule. Addition of excess of aqueous solution of ammonia to this solution gives _________. 0 0. 15. 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. We have nitrous acid, with a chemical formula of #HNO_2#.It is a neutral molecule as well. 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. (ii) PH3 can act as a ligand in the formation of a coordination compound, (iv) Covalency of nitrogen in N2O5 is four, 15. (ii) both O2 and Xe has the same electron gain enthalpy. 43. p - block element But it must be remembered that the covalency of nitrogen remains 4 only as it cannot exceed it. Molecular weight calculation: 14.0067 + 15.9994*2 ›› Percent composition by element (iv) Interhalogen compounds are more reactive than halogen compounds. It is non-flammable and will not support combustion. In the preparation of HNO3, we get NO gas by catalytic oxidation of ammonia. HCl, a black precipitate is obtained. 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