s-Block Elements PYQs Set 2 (PDF)

Set 2 of 20 · Questions 31-60 of 573

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Mere Teacher · Previous Year Questions NEET Chemistry · s-Block Elements · Set 2 (Q31-60)
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31. $Identify the correct statement from the following: I. Quartz is a piezoelectric material. II. All group 14 tetrachlorides except CCl_{4} are easily hydrolysed by water. III. The C - C bond distance within the layer of graphite is 154 pm . IV. SiO_{2} is soluble in aqueous HCl solution.$ (1) $I, III$ (2) $I, II$ (3) $III, IV$ (4) $II, IV$ 32. $Identify the correct statements from the following. i. Melting points and boiling points of group 13 elements are much higher than those of corresponding group 14 elements ii. SiO only exists at high temperatures iii. PbI_{4} does not exist iv. Buckminster fullerene contain twelve 6 -membered carbon rings and twenty 5 - membered carbon rings.$ (1) $i, iii only$ (2) $ii, iii, iv only$ (3) $ii, iii only$ (4) $i, iv only$ 33. $P_{4} + 3 NaOH + 3 H_{2} O \to CO 23 X + PH_{3} ↑ X \to Hcl (aq .) Y + NaCl The incorrect statement about Y is$ (1) $It is also called phosphonic acid$ (2) $It is a monobasic acid$ (3) $It is a reducing agent$ (4) $Oxidation state of the central atom in it is +1$ 34. $The sequence of ionic mobility in aqueous solution is$ (1) $R b^{+} > K^{+} > C s^{+} > N a^{+}$ (2) $N a^{+} > K^{+} > R b^{+} > C s^{+}$ (3) $K^{+} > N a^{+} > R b^{+} > C s^{+}$ (4) $C s^{+} > R b^{+} > K^{+} > N a^{+}$ 35. $Which of the following elements has the lowest melting point?$ (1) $Sn$ (2) $Pb$ (3) $Si$ (4) $Ge$ 36. $What products are expected from the disproportionation reaction of hypochlorous acid?$ (1) $H C l O_{3} and C l_{2} O$ (2) $H C l O_{2} and H C l O_{4}$ (3) $HCl and C l_{2} O$ (4) $HCl and H C l O_{3}$ 37. $Which of the following statements is false?$ (1) $C a^{2 +} ions are not important in maintaining the regular beating of the heart.$ (2) $M g^{2 +} ions are important in the green parts of the plants.$ (3) $M g^{2 +} ions form a complex with ATP$ (4) $C a^{2 +} ions are important in blood clotting.$ 38. $Zeolite is a silicate of two metal ions X and Y . X and Y are respectively$ (1) $Ca^{2 +}, Na^{+}$ (2) $Mg^{2 +}, Na^{+}$ (3) $Na^{+}, Al^{3 +}$ (4) $Ca^{2 +}, Mg^{2 +}$ 39. $In group 13 of the long form of periodic table an element X has a boiling point of T_{2} (K) and melting point of T_{1} (K) . Identify the element X for which T_{2} - T_{1} (K) is maximum$ (1) $Al$ (2) $Ga$ (3) $In$ (4) $B$ 40. $Small quantities of NO and HNO_{3} are formed as impurities, when N_{2} is prepared from NH_{4} Cl (aq) and NaNO_{2} (aq), these impurities can be removed by passing the N_{2} gas through which of the following?$ (1) $H_{2} SO_{4} (aq) containing SO_{3}$ (2) $H_{2} SO_{4} (aq) containing K_{2} Cr_{2} O_{7}$ (3) $H_{2} SO_{4} (aq) containing KMnO_{4}$ (4) $HCl (aq) containing KMnO_{4}$ 41. $The alkali metals form salt‐like hydrides by the direct synthesis at elevated temperature. The thermal stability of these hydrides decreases in which of the following orders?$ (1) $N a H > L i H > K H > R b H > C sH$ (2) $L i H > N a H > K H > R b H > C sH$ (3) $C sH > R b H > K H > N a H > L i H$ (4) $K H > N a H > L i H > C sH > R b H$ 42. $Identify the correct statements with respect to compounds of Beryllium I. Beryllium oxide is amphoteric in nature II. Beryllium hydride is formed by the reaction of beryllium with hydrogen III. Beryllium hydride is formed by the reaction of beryllium chloride with lithium aluminium hydride IV. Beryllium sulphate is the least soluble sulphate among the sulphates of alkaline earth metals.$ (1) $I & II only$ (2) $I & III only$ (3) $II & IV only$ (4) $II & III only$ 43. $The relative order of electronegativity of C, Ge, and Pb is$ (1) $C > Ge > Pb$ (2) $Ge > C > Pb$ (3) $Pb > C > Ge$ (4) $C > Pb > Ge$ 44. $Which one of the following reactions of Xenon compounds is not feasible ?$ (1) $3XeF4 + 6H2O \to 2Xe + XeO3 + 12HF + 1.5O2$ (2) $2XeF2 + 2H2O \to 2Xe + 4HF + O2$ (3) $XeF6 + RbF \to Rb[XeF7]$ (4) $XeO3 + 6HF \to XeF6 + 3H2O$ 45. $In which of the following, NH_{3} is not used?$ (1) $Nessler's reagent$ (2) $Group reagent for the analysis of IV group basic radical$ (3) $Group reagent for the analysis of III group basic radical$ (4) $Tollens' reagent$ 46. $Portland cement contains 'X' to enhance the setting time. What is 'X'?$ (1) $C a S O_{4} . \frac{1}{2} H_{2} O$ (2) $C a S O_{4} . 2 H_{2} O$ (3) $C a S O_{4}$ (4) $C a C O_{3}$ 47. $Match the following List-I (Substance) (A) Na_{2} O_{2} (B) D_{2} O (C) Cs (D) Mg (OH)_{2} List-II (Use) I. Photoelectric cells II. Antacid III. Oxidising agent IV. Moderator The correct answer is$ (1) $A-III, B-IV, C-I, D-II$ (2) $A-IV, B-III, C-II, D-I$ (3) $A-III, B-IV, C-II, D-I$ (4) $A-II, B-IV, C-I, D-III$ 48. $The product obtained as a result of a reaction of nitrogen with C a C_{2} is$ (1) $C a C N_{3}$ (2) $C a_{2} C N$ (3) $C a C N_{2}$ (4) $CaCN$ 49. $What are the products formed in sequence when excess of C O_{2} is passed in slaked lime?$ (1) $Ca (H C O_{3})_{2},CaCO_{3}$ (2) $C a C O_{3},Ca (H C O_{3})_{2}$ (3) $CaO,Ca (H C O_{3})_{2}$ (4) $CaO, C a C O_{3}$ 50. $Which one of the following compounds is used as a chemical in certain type of fire extinguishers?$ (1) $Baking Soda$ (2) $Soda ash$ (3) $Washing Soda$ (4) $Caustic Soda$ 51. $Sodium nitrite with hydrochloric acid gives water along with two nitrogen oxides. They are$ (1) $NO, NO_{2}$ (2) $NO_{2}, N_{2} O_{3}$ (3) $NO_{2}, N_{2} O$ (4) $NO, N_{2} O_{5}$ 52. $Match List I with List II List I Elements A. K B. Ca C. Sr D. Ba List II Colour imparted to the flame I. Brick Red II. Violet III. Apple Green IV. Crimson Red Choose the correct answer from the options given below:$ (1) $A-II, B-I, C-III, D-IV$ (2) $A-II, B-IV, C-I, D-III$ (3) $A-II,B-I,C-IV,D-III$ (4) $A-IV, B-III, C-II, D-I$ 53. $The substance used in holmes singnals of the ship is a mixture of :$ (1) $CaC2 + Ca3P2$ (2) $Ca3(PO4)2 + Pb3O4$ (3) $H3PO4 + CaCl2$ (4) $NH3 + HOCl$ 54. $Among the following, the incorrect statement is$ (1) $Cesium forms superoxide$ (2) $Sodium peroxide is paramagnetic$ (3) $Lithium chloride is deliquescent$ (4) $White metal is an alloy of lithium and lead$ 55. $The correct order of reducing ability of the following hydrides is$ (1) $BiH_{3} > SbH_{3} > PH_{3} > NH_{3}$ (2) $NH_{3} > PH_{3} > SbH_{3} > BiH_{3}$ (3) $SbH_{3} > BiH_{3} > PH_{3} > NH_{3}$ (4) $PH_{3} > BiH_{3} > SbH_{3} > NH_{3}$ 56. $In the following reaction, I_{2} + H_{2} O + Cl_{2} ⟶ X + Y, the products X and Y respectively are$ (1) $HClO_{4}, HI$ (2) $I_{2} O_{7}, HCl$ (3) $HIO_{3}, HCl$ (4) $ICl_{3}, HCl$ 57. $The alkali metal with lowest E_{M^{+} / M}^{\circ} (V) is X and the alkali metal with highest E_{M^{+} / M}^{\circ} (V) is Y . Then X and Y are respectively$ (1) $Li, Na$ (2) $Li, Cs$ (3) $Na, Li$ (4) $Cs, Li$ 58. $Assertion (A) : Graphite is used as a dry lubricant in machines which run at high temperaturesReason (R): The layers of graphite slip one over the other when pressure is applied The correct option among the following is$ (1) $(A) is true but (R) is false$ (2) $(A) is false but (R) is true$ (3) $(A) and (R) aretrue . (R) isthecorrectexplanation of (A)$ (4) $(A) and (R) are true, but (R) is not correct explanation of (A)$ 59. $The sum of oxygen atoms in the formulae of peroxysulphuric acid and pyrosulphuric acid is$ (1) $7$ (2) $12$ (3) $15$ (4) $13$ 60. $A and B are formed when borax is dissolved in water. C and B are formed when borax is reacted with aqueous HCl solution. What are A and C respectively?$ (1) $NaCl, NaOH$ (2) $NaOH, NaCl$ (3) $NaBO_{2}, NaCl$ (4) $NaOH, NaBO_{2}$