Chapterwise Previous year Qs 178 CHAPTER THE P –BLOCK ELEMENTS (GROUP 15,16,17,18) 1. Bleaching powder is obtained by the action of chlorine gas and [1988] (a) dilute solution of Ca(OH) 2 (b) concentrated solution of Ca(OH) 2 (c) dry CaO (d) dry slaked lime Ans: (d) 2. Hypo is used in photography to [1988] (a) Reduce AgBr grains to metallic silver (b) Convert metallic silver to silver salt (c) Remove undecomposed silver bromide as a soluble complex (d) Remove reduced silver Ans: (c) 3. Which of the following is a nitric acid anhydride? [1988] (a) NO (b) NO2 (c) N2O5 (d) N2O3 Ans: (c) 4. Oxygen will directly react with each of the following elements except [1989] (a) P (b) Cl (c) Na (d) S. Ans: (b) 5. Bleaching powder reacts with a few drops of dilute HCl to give [1989] (a) chlorine (b) hypochlorous acid (c) calcium oxide (d) oxygen Ans: (a) 6. Of the following hybrides which one has the lowest boiling point? [1989] (a) AsH3 (b) SbH3 (c) PH3 (d) NH3 Ans: (c) 7. Which of the following metal evolves hydrogen on reacting with cold dilute HNO3? [1989] (a) Mg (b) Al (c) Fe (d) Cu. Ans: (a) 8. Which one of the following compounds does not exist? [1989] (a) NCl5 (b) AsF5 (c) SbCl5 (d) PF5 Ans: (a) 9. Each of the following is true about white and red phosphorus except that they [1989] (a) Are both soluble in CS2 (b) Can be oxidised by heating in air (c) Consist of the same kind of atoms (d) Can be converted into one another Ans: (a) 10. When orthophosphoric acid is heated to 600°C, the product formed is [1989] (a) PH3 (b) P2O5 (c) H3 PO3 (d) HPO3 Ans: (d) 11. Which one has the lowest boiling point ?[1989] (a) NH3 (b) PH3 (c) AsH3 (d) SbH3 Ans: (b) 12. The gases respectively absorbed by alkaline pyrogallol and oil of cinnamon are [1989] (a) O3, CH4 (b) O2, O3 (c) SO2 ,CH4 (d) N2O, O3. Ans: (b)
Transcript
Chapterwise Previous year Qs
178
CHAPTER
THE P –BLOCK ELEMENTS
(GROUP 15,16,17,18)
1. Bleaching powder is obtained by the action of chlorine gas and [1988] (a) dilute solution of Ca(OH) 2 (b) concentrated solution of Ca(OH) 2 (c) dry CaO (d) dry slaked lime Ans: (d) 2. Hypo is used in photography to [1988] (a) Reduce AgBr grains to metallic silver (b) Convert metallic silver to silver salt (c) Remove undecomposed silver bromide as a soluble complex (d) Remove reduced silver Ans: (c) 3. Which of the following is a nitric acid anhydride? [1988] (a) NO (b) NO2 (c) N2O5 (d) N2O3 Ans: (c) 4. Oxygen will directly react with each of the following elements except [1989] (a) P (b) Cl (c) Na (d) S. Ans: (b) 5. Bleaching powder reacts with a few drops of dilute HCl to give [1989] (a) chlorine (b) hypochlorous acid (c) calcium oxide (d) oxygen Ans: (a) 6. Of the following hybrides which one has the lowest boiling point? [1989] (a) AsH3 (b) SbH3 (c) PH3 (d) NH3 Ans: (c)
7. Which of the following metal evolves hydrogen on reacting with cold dilute HNO3? [1989] (a) Mg (b) Al (c) Fe (d) Cu. Ans: (a) 8. Which one of the following compounds does not exist? [1989] (a) NCl5 (b) AsF5 (c) SbCl5 (d) PF5 Ans: (a) 9. Each of the following is true about white and red phosphorus except that they [1989] (a) Are both soluble in CS2 (b) Can be oxidised by heating in air (c) Consist of the same kind of atoms (d) Can be converted into one another Ans: (a)
10. When orthophosphoric acid is heated to
600°C, the product formed is [1989] (a) PH3 (b) P2O5 (c) H3 PO3 (d) HPO3 Ans: (d) 11. Which one has the lowest boiling point ?[1989] (a) NH3 (b) PH3 (c) AsH3 (d) SbH3 Ans: (b) 12. The gases respectively absorbed by alkaline pyrogallol and oil of cinnamon are [1989] (a) O3, CH4 (b) O2, O3 (c) SO2 ,CH4 (d) N2O, O3. Ans: (b)
13. It is possible to obtain oxygen from air by fractional distillation because [1989] (a) oxygen is in a different group of the periodic table from nitrogen (b) oxygen is more reactive than nitrogen (c) oxygen has higher b.p. than nitrogen (d) oxygen has a lower density than nitrogen. Ans: (c) 14. Which of the following statements is not correct for nitrogen? [1990] (a) Its electronegativity is very high (b) d-orbitals are available for bonding (c) It is a typical non-metal (d) Its molecular size is small Ans: (b) 15. The bleaching action of chlorine is due to [1991] (a) Reduction (b) Hydrogenation (c) Chlorination (d) Oxidation Ans: (d) 16. Which would quickly absorb oxygen? [1991] (a) Alkaline solution of pyrogallol (b) Conc. H2 SO4 (c) Lime water (d) Alkaline solution of CuSO4 Ans: (a) 17. Oleum is [1991] (a) Castor Oil (b) Oil of vitriol (c) Fuming H2 SO4 (d) None of them Ans: (c) 18. Aqueous solution of ammonia consists of [1991] (a) H+ (b) OH– (c) NH4 + (d) NH4+ and OH– Ans: (d) 19. P2O5 is heated with water to give [1991] (a) Hypophosphorous acid (b) Phosphorous acid (c) Hypophosphoric acid (d) Orthophosphoric acid Ans: (d)
20. Basicity of orthophosphoric acid is [1991] (a) 2 (b) 3 (c) 4 (d) 5 Ans: (b) 21. PCl3 reacts with water to form [1991] (a) PH3 (b) H3 PO3, HCl (c) POCl3 (d) H3 PO4 Ans: (b) 22. PH4 I+ NaOH forms [1991] (a) PH3 (b) NH3 (c) P4O6 (d) P4O10 Ans: (a) 23. Pure nitrogen is prepared in the laboratory by heating a mixture of [1991] (a) NH4OH+ NaCl (b) NH4 NO3 + NaCl (c) NH4 Cl + NaOH (d) NH4 Cl + NaNO2 Ans: (d) 24. Which one of the following substance is used in the laboratory for fast drying of neutral gases? [1992] (a) Phosphorus pentoxide (b) Active charcoal (c) Anhydrous calcium chloride (d) Na3 PO4 Ans: (a) 25. Number of electrons shared in the formation of nitrogen molecule is [1992] (a) 6 (b) 10 (c) 2 (d) 8 Ans: (a) 26. Sugarcane on reaction with nitric acid gives [1992] (a) CO2 and SO2 (b) (COOH) 2 (c) 2 HCOOH(two moles) (d) No reaction. Ans: (b) 27. Nitrogen is relatively inactive element because [1992]
Chapterwise Previous year Qs
180
(a) Its atom has a stable electronic configuration (b) It has low atomic radius (c) Its electronegativity is fairly high (d) Dissociation energy of its molecule is fairly high Ans: (d) 28. H3 PO2 is the molecular formula of an acid of phosphorus. Its name and basicity respectively are [1992] (a) Phosphorus acid and two (b) Hypophosphorous acid and two (c) Hypophosphorous acid and one (d) Hypophosphoric acid and two Ans: (c) 29. When chlorine is passed over dry slaked lime at room temperature, the main reaction product is [1992] (a) 2 2 Ca(ClO) (b) CaCl2 (c) CaOCl2 (d) 2 Ca(OCl) Ans: (c) 30. In the manufacture of bromine from sea water, the mother liquor containing bromides is treated with [1992] (a) Carbon dioxide (b) Chlorine (c) Iodine (d) Sulphur dioxide Ans: (b) 31. Which of the following fertilizers has the highest nitrogen percentage? [1993] (a) Ammonium sulphate (b) Calcium cyanamide (c) Urea (d) Ammonium nitrate Ans: (c) 32. Asolution of potassium bromide is treated with each of the following. Which one would liberate bromine? [1993] (a) Hydrogen iodide (b) Sulphur dioxide (c) chlorine (d) Iodine Ans: (a) 33. Acertain compound when treated with copper sulphate solution yields a brown precipitate. On adding hypo solution, the precipitate turns white. The compound is [1994]
(a) K2CO3 (b) KI (c) KBr (d) K3 PO4 Ans: (b) 34. Noble gases do not react with other elements because [1994] (a) They are mono atomic (b) They are found in abundance (c) The size of their atoms is very small (d) They are completely Ans: (d) 35. Which of the following statements is false? [1994] (a) Radon is obtained from the decay of radium (b) Helium is inert gas (c) Xenon is the most reactive among the rare gases (d) The most abundant rare gas found in the atmosphere is helium Ans: (d) 36. HI can be prepared by all the following methods, except [1994]
(a)
(b)
(c)
(d) Ans: (b) 37. Which among the following is paramagnetic? [1994] (a) Cl2O (b) ClO2 (c) Cl2O7 (d) Cl2O6 Ans: (b) 38. Which one of the following oxides of chlorine is obtained by passing dry chlorine over silver chlorate at 90°C? [1994] (a) Cl O2 (b) ClO3 (c) ClO2 (d) ClO4 Ans: (c) 39. The formula for calcium chlorite is [1994] (a) Ca(ClO4) 2 (b) Ca(ClO3) 2 (c) CaClO2 (d) Ca(ClO2) 2
Chapterwise Previous year Qs
181
Ans: (d)
40. Polyanion formation is maximum in [1994]
(a) Nitrogen (b) Oxygen (c) Sulphur (d) Boron Ans: (c) 41. The acid which has a peroxy linkage is [1994] (a) Sulphurous acid (b) Pyrosulphuric acid (c) Dithionic acid (d) Caro’s acid Ans: (d) 42. Brown ring test is used to detect [1994] (a) Iodine (b) Nitrate (c) Iron (d) Bromide Ans: (b) 43. About 20 km above the earth, there is an ozone layer. Which one of the following statements about ozone and ozone layer is true? [1995] (a) ozone has a triatomic linear molecule (b) it is harmful as it stops useful radiation (c) it is beneficial to us as it stops U.Vradiation (d) conversion of O3 to O2 is an endothermic reaction Ans: (c) 44. By passing H2Sgas in acidified KMnO4 solution, we get [1995] (a) S (b) K2 S (c) MnO2 (d) K2 SO3 Ans: (a) 45. Regarding F– and Cl– which of the following statements is/are correct? Cl– can give up an electron more easily than F– (ii) Cl– is a better reducing agent than F– (iii) Cl– is smaller in size
than F– (iv) F– can be oxidized more readily than Cl– [1996] (a) and (ii) (b) , (ii) and (iv) (c) (iii) and (iv) (d) only Ans: (d) 46. Which of the following oxides will be the least acidic? [1996] (a) As4O6 (b) As4O10 (c) P4O10 (d) P4O6 Ans: (a) 47. Oxidation of thiosulphate by iodine gives [1996] (a) tetrathionate ion (b) sulphide ion (c) sulphate ion (d) sulphite ion Ans: (a) 48. Which one is the correct order of the size of iodine species? [1997] (a) I > I+ > I– (b) I > I– > I+ (c) I+ > I– > I (d) I– > I > I+ Ans: (d) 49. Which of the following species has the highest dipole moment? [1997] (a) NH3 (b) PH3 (c) AsH3 (d) SbH3 Ans: (a) 50. The structural formula of hypophosphorous acid is [1997]
(d) Ans: (a) 51. Aone litre flask is full of brown bromine vapour. The intensity of brown colour of vapour will not decrease appreciably on adding to the flask some [1998] (a) pieces of marble (b) animal charcoal powder (c) carbon tetrachloride (d) carbon disulphide Ans: (a) 52. Repeated use of which one of the following fertilizers would increase the acidity of the soil? [1998] (a) Urea (b) Superphosphate of lime (c) Ammonium sulphate (d) Potassium nitrate Ans: (c) 53. During its reactions, ozone [1999] (a) can only combine with hydrogen atoms (b) accepts electrons (c) loses electrons (d) shows the role of electrons to be irrelevant Ans: (a) 54. Which of the following oxy-acids has the maximum number of hydrogens directly attached to phosphorus? [1999] (a) H4 P2O7 (b) H3 PO2 (c) H3 PO3 (d) H3 PO4 Ans: (b) 55. Which one of the following arrangements does not truly represent the property indicated against it? [2000] (a) Br2 < Cl2 < F2: Electronegativity (b) Br2 < F2 < Cl2: Electron affinity (c) Br2 < Cl2 < F2: Bond energy (d) Br2 < Cl2 < F2: Oxidising power Ans: (c) 56. Nitrogen forms N2, but phosphorus is converted into P4 from P, the reason is [2001] (a) Triple bond is present between phosphorus atom
(b)
(c)
(d) Ans: (c) 57. Which of the following statements is not true? [2003] (a) HFis a stronger acid than HCl (b) Among halide ions, iodide is the most powerful reducing agent (c) Fluorine is the only halogen that does not show a variable oxidation state (d) HOCl is a stronger acid than HOBr Ans: (a) 58.
[2004] (a) Proton acceptor only (b) Both oxidized and reduced (c) Oxidized only (d) Reduced only Ans: (b) 59. The correct order of acid strength is: [2005] (a) HClO4 < HClO3 < HClO2 < HClO (b) HClO< HClO2 < HClO3 < HClO4 (c) HClO4 < HClO< HClO2 < HClO3 (d) HClO2 < HClO3 < HClO4 < HClO Ans: (b) 60. Which of the following is the most basic oxide? [2006] (a) Sb2O3 (b) Bi2O3 (c) SeO2 (d) Al2O3 Ans: (b) 61. Which one of the following orders is not in accordance with the property stated against is? [2006] (a) HI> HBr > HCl > HF: Acidic property in water (b) F2 > Cl2 > Br2 > I2: Electronegativity (c) F2 > Cl2 > Br2 > I2: Bond dissociation energy (d) F2 > Cl2 > Br2 > I2: Oxidising power Ans: (c) 62. Which one of the following orders correctly represents the increasing acid strengths of the given acids? [2007] (a) HOClO< HOCl < HOClO3 < HOClO2 (b) HOClO2 < HOClO3 < HOClO< HOCl
Chapterwise Previous year Qs
183
(c) HOClO3 < HOClO2 < HOClO< HOCl (d) HOCl < HOClO< HOClO2 < HOClO3 Ans: (d) 63. Which one of the following arrangements does not give the correct picture of the trends indicated against it? [2008] (a) F2 > Cl2 > Br2 > I2: Oxidizing power (b) F2 > Cl2 > Br2 > I2: Electron gain enthalpy (c) F2 > Cl2 > Br2 > I2: Bond dissociation energy (d) F2 > Cl2 > Br2 > I2: Electronegativity. Ans: (c) 64. In the case of alkali metals, the covalent character decreases in the order: [2009] (a) MF> MCl > MBr > MI (b) MF> MCl > MI> MBr (c) MI> MBr > MCl > MF (d) MCl > MI> MBr > MF Ans: (c) 65. Among the following which is the strongest oxidising agent? [2009] (a) Br2 (b) I2 (c) Cl2 (d) F2 Ans: (d) 66. The correct order of increasing bond angles in the following species are: [2010]
(a)
(b)
(c)
(d) Ans: (c) 67.
[2010] (a) + 3, + 5, + 4 (b) + 5, + 3, + 4 (c) + 5, + 4, + 3 (d) + 3, + 4, + 5 Ans: (b) 68. Which one of the following compounds is a peroxide? [2010] (a) KO2 (b) BaO2 (c) MnO2 (d) NO2
Ans: (b) 69. [2010] (a) (b) (c) (d) Ans: (a)
70. How many bridging oxygen atoms are present in P4O10? [2010] (a) 5 (b) 6 (c) 4 (d) 2 Ans: (b) 71. Which of the following structures is the most preferred and hence of lowest energy for SO3? [2011 M] [2011]
(a)
(b)
(c)
(d) Ans: (d) 72. Which of the following oxide is amphoteric? [2011] (a) SnO2 (b) CaO[2011 M] (c) SiO2 (d) CO2 Ans: (a)
73. In which of the following compounds, nitrogen exhibits highest oxidation state? [2012] (a) N2H4 (b) NH3 (c) N3H (d) NH2OH Ans: (c) 74. Which of the following statements is not valid for oxoacids of phosphorus? [2012] (a) Orthophosphoric acid is used in the manufacture of triple superphosphate. (b) Hypophosphorous acid is a diprotic acid. (c) All oxoacids contain tetrahedral four coordinated phosphorus. (d) All oxoacids contain atleast one P= Oand one P— OHgroup. Ans: (b) 75. Sulphur trioxide can be obtained by which of the following reaction: [2012]
(a)
(b)
(c)
(d) Ans: (b) 76. In which of the following arrangements the given sequence is not strictly according to the property indicated against it? [2012] (a) HF< HCl < HBr < HI: increasing acidic strength (b) H2O< H2 S< H2 Se < H2 Te: increasing pKa values (c) NH3 < PH3 < AsH3 < SbH3: increasing acidic character (d) CO2 < SiO2 < SnO2 < PbO2: increasing oxidising power Ans: (b) 77. Which is the strongest acid in the following: [2013] (a) HClO3 (b) HClO4 (c) H2 SO3 (d) H2 SO4 Ans: (b) 78. Which of the following does not give oxygen on heating? [2013]
(a) Zn(ClO3) 2 (b) K2Cr2O7 (c) (NH4) 2 Cr2O7 (d) KClO3 Ans: (c) 79. Which of the following is a polar molecule? [2013] (a) SF4 (b) SiF4 (c) XeF4 (d) BF3 Ans: (a) 80. Identify the incorrect statement, regarding the molecule XeO4: [2013]
![CHAPTERWISE ‘A’ LEVEL QUESTIONS SUBJECT – MATHEMATICS … · 2013-09-11 · CHAPTERWISE ‘A’ LEVEL QUESTIONS – Class XII – MATHEMATICS – By OP GUPTA [+91-9650 350 480]](https://static.documents.pub/doc/80x56/5eb1991b781aa54f8a2d62d4/chapterwise-aaa-level-questions-subject-a-mathematics-2013-09-11-chapterwise.jpg)
