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10. The acid formed when iodine reacts with concentrated nitric acid is, 1) lodic acid 2) Nitrous acid 3) Hydroiodic acid 4) Per-iodic acid, 11. Which of the following acids forms three series of salts?, 1) HsPOz 2) HsBOs 3) HsPO, 4) Hy POs, 12. One mole of calcium phosphide on reaction with excess water gives, 1) One mole of phosphine, 2) Two moles of phosphoric acid, 3) Two moles of phosphine, 4) One mole of phosphorous pentoxide, , 13. In the Haber's process, metallic oxides catalyse reaction between gaseous nitrogen and hydrogen to, , yield ammonia whose volume (STP) relative to the total volume of the reactants taken (STP) would, , be, 1) One - fourth 2) One - half 3) Same 4) Three - fourth, 14. Which of the following catalysts is commonly employed in the manufacture of ammonia by the, Haber's process?, 1) Finely divided platinum together with a nickel promoter, 2) Finely divided nickel together with a platinum promoter, 3) Finely divided Iron together with a Molybdenum promoter, 4) Finely divided palladium together with a zinc promoter, 15. Phosphine is not obtained ,when, 1) Red P is heated with NaOH 2) White P is heated with NaOH, 3) CasP2 reacts with water 4) Phosphorus trioxide is boiled with water, 16. When phosphorus when boiled with strong solution of caustic produces, 1) Sodium phosphide 2) Sodium phosphate 3) Phosphine 4) Red phosphorus, 17. Which one of the following combines with Fe (11) ions to form a brown complex?, 1) NO 2) N20 3) NoOs 4) No05, 18. The number of P=0 and P-O-H bonds in HPQ, are respectively, 1) 3,1 2) 2,2 3)1,2 4)1,3, 19. Which of the follawing is a cyclic oxoacid?, 1) HeP20; 2) H4P206 3) H3P309 4) HsPsO1s, 20. Which acid has P-P linkage?, 1) Hypophosphoric acid 2) Pyrophosphoric acid, 3) Metaphosphoric acid 4) Orthophosphoric acid

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21. An example of tetrabasic acid is, 1) orthophosphorous acid 2) orthophosphoric acid, 3) Metaphosphoric acid 4) pyrophosphoric acid, 22. Which one is monobasic acid?, 1) HyP02 2) HaPOs 3) HaPOs 4) HaPOs, 23. Among the trihalides of nitrogen , which one is the least basic ?, 1) NF3 2) NCls 3) NBrs 4)NIs, 24. With respect to protonic acids, which of the following statements is correct?, 1) PHs is more basic than NH3 2) PHs is less basic than NH3, 3) PHs is equally basic as NH3 4) PHa is amphoteric while NHs is basic, 25. Which of the following options is correctly characterized by the given statement?, i) It is formed when red phosphorous is heated in a sealed tube at 803 k, ii) It can be sublimed in air, iii) [thas a opaque monoclinic or rhombohedral crystals., 1) White P 2) Yellow P 3) a- black P 4) B-black P, 26. Elements 0, S, Se and Te are usually known as, 1) Metals 2) Rare earth metals 3) Coinage metals 4) Chalcogens, 27. Oxygen is gas but sulphur is solid because, 1) Oxygen is composed of discrete molecules while sulphur is polymeric, 2) Molecular weight of sulphur is much higher than that of oxygen, 3) Oxygen is a stronger oxidizing agent than sulphur, 4) Boiling point of sulphur is much higher than that of oxygen, 28. Strongest reducing agent is, 1) H20 2) H2S 3) H2Se 4) HeTe, , 29. Oxygen differs from sulphur in, , 1) Allotropy 3) Number of electrons in outermost orbit, 2) Formation of ions 4) Nature of hydrides, 30. Bleaching action of $02 is due to its, 1) Oxidising property 2) Acidic property, 3) Reducing property 4) Basic property, 31. Which of the following is least acidic but possesses highest thermal stability?, 1) H20 2) HS 3) HoSe 4) HoTe

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32. Starch paper moistened with KI solution turns blue in ozone because of, , 1) lodine liberation 3) Oxygen liberation, , 2) Alkali formation 4) Ozone reacts with litmus paper, 33. Which of the following is incorrect?, , 1) Ozis weaker oxidant than Oz, , 2) Os has larger bond length than 02, , 3) Both Oz and Os are paramagnetic, , 4) Oz is linear and 0s is angular in shape, 34. $03 when absorbed in 98 % H2S0, it farms, , 1) More Conc. H2S04 2) H2S03 3) H2S20¢ 4) H2S207, 35. Which gives carbon with conc. H2S0¢?, , 1) Formic acid 2) Ethyl alcohol 3) Oxalic acid 4) Starch, , 36. In contact process impurities of arsenic are removed by, 1) Al (OH); 2) Fe(OH); 3) Cr{(OH)3 4) Fe203, , 37. lron sulphide is heated in air to form A, an oxide of sulphur . A dissolved in water to give an acid., , The basicity of this acid is ......., 1)2 2)3 3)1 4) zero, 38. SOz reacts with Clz in sunlight to form, 1) Sulphuryl chloride 3) Sulphur dioxide, 2) Sulphanyl chloride 4) None of these, 39. Mark the incorrect statement, 1) The chemical reactions of H2S0, are as a result of its ability to act as an oxidizing agent, 2) Dilution of oleum with water gives H2S0,, 3) The key step in the manufacture of HzSOs, is the catalytic reduction of SOz, 4) H2SOs, because of its low volatility can be used to manufacture more volatile acids, from their corresponding salts, 40. Which of the following represents the correct order of decreasing number of S=O bonds?, 1) H2S03 > H2S20s > H2S0x, 2) HeS20g> HeSOs, > H2SO3, 3) H2S20g> HzSO3 > H2SO4, 4) H2SO4 > H2S03 > H2S208, 41. The acid used in lead storage cells is, 1) Phosphoric acid 2) Nitric acid 3) Sulphuric acid = 4) Hydrochloric acid