p-Block Elements PYQs Set 3 (PDF)

Set 3 of 14 · Questions 61-90 of 400

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Mere Teacher · Previous Year Questions NEET Chemistry · p-Block Elements · Set 3 (Q61-90)
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61. $The non-metal that does not exhibit positive oxidation state is$ (1) $Fluorine$ (2) $Oxygen$ (3) $Chlorine$ (4) $Iodine$ 62. $The number of ions from the following that are expected to behave as oxidising agent is : Sn^{4 +}, Sn^{2 +}, Pb^{2 +}, Tl^{3 +}, Pb^{4 +}, Tl^{+}$ (1) $3$ (2) $2$ (3) $1$ (4) $4$ 63. $Among the following molecules, (i) XeO3 (ii) XeOF4 (iii) XeF6 those having same number of lone pairs on Xe are$ (1) $(i) and (ii) only$ (2) $(i) and (iii) only$ (3) $(ii) and (iii) only$ (4) $(i), (ii) and (iii)$ 64. $Find A, B and C in the following reaction: NH_{3} + A + CO_{2} \to (NH_{4})_{2} CO_{3} (NH_{4})_{2} CO_{3} + H_{2} O + B \to N H_{4} HC O_{3} N H_{4} HC O_{3} + NaCl \to N H_{4} Cl + C$ (1) $A - H_{2} O; B - C O_{2}; C - NaHC O_{3}$ (2) $A - H_{2} O; B - O_{2}; C - Na 2 C O_{3}$ (3) $A - O_{2}; B - C O_{2}; C - Na 2 C O_{3}$ (4) $A - H_{2} O; B - O_{2}; C - NaHC O_{3}$ 65. $Which halogen has the highest value of negative electron gain enthalpy?$ (1) $Fluorine$ (2) $Chlorine$ (3) $Bromine$ (4) $Iodine$ 66. $Given below are two statements: one is labelled as Assertion (a) and the other is labelled as Reason (R) Assertion (a) : Boron is unable to form B F_{6}^{3 -} Reason (R) : Size of B is very small. choose the correct answer from the options given below:$ (1) $Both (a) and (R) are true and (R) is the correct explanation of (a)$ (2) $Both (a) and (R) are true but (R) is not the correct explanation of (a)$ (3) $(a) is true but (R) is false$ (4) $(a) is false but (R) is true$ 67. $Correct statements among a to d regarding silicones are: (A) They are polymers with hydrophobic character. (B) They are biocompatible. (C) In general, they have high thermal stability and low dielectric strength. (D) Usually, they are resistant to oxidation and used as greases.$ (1) $(A), (B), (C) and (D)$ (2) $(A), (B) and (C) only$ (3) $(A) and (B) only$ (4) $(A), (B) and (D) only$ 68. $A metal on combustion in excess air forms X. X upon hydrolysis with water yields H_{2} O_{2} and O_{2} along with another product. The metal is :$ (1) $Mg$ (2) $Li$ (3) $Na$ (4) $Rb$ 69. $Given below are the atomic numbers of some group 14 elements. The atomic number of the element with lowest melting point is:$ (1) $6$ (2) $82$ (3) $14$ (4) $50$ 70. $Which of the statements given below is incorrect?$ (1) $O_{3} molecule is bent.$ (2) $ONF is isoelectronic with O_{2} N^{-} .$ (3) $O F_{2} is an oxide of fluorine.$ (4) $C l_{2} O_{7} is an anhydride of perchloric acid.$ 71. $The B C l_{3} is a planar molecule whereas N C l_{3} is pyramidal because$ (1) $nitrogen atom is smaller than boron atom$ (2) $B C 1_{3} has no lone pair but N C l_{3} has a lone pair of electrons$ (3) $B—CI bond is more polar than N—CI bond$ (4) $N—CI bond is more covalent than B—CI bond.$ 72. $The basic character of hydrides of the V group elements decreases in the order$ (1) $N H_{3} > P H_{3} > A s H_{3} > S b H_{3}$ (2) $S b H_{3} > A s H_{3} > P H_{3} > N H_{3}$ (3) $S b H_{3} > P H_{3} > A s H_{3} > N H_{3}$ (4) $N H_{3} > S b H_{3} > P H_{3} > A s H_{3}$ 73. $For H_{3} P O_{3} and H_{3} P O_{4}, the correct choice is :$ (1) $H_{3} P O_{3} is dibasic and reducing$ (2) $H_{3} P O_{3} is dibasic and non-reducing$ (3) $H_{3} P O_{4} is tribasic and reducing$ (4) $H_{3} P O_{3} is tribasic and non-reducing$ 74. $Carbon forms two oxides which have different compositions. The equivalent mass of which remains constant?$ (1) $Oxygen$ (2) $Carbon$ (3) $Both carbon and oxygen$ (4) $Neither carbon nor oxygen$ 75. $The correct order regarding the electronegativity of hybrid orbitals of carbon is$ (1) $s p < s p^{2} < s p^{3}$ (2) $s p > s p^{2} < s p^{3}$ (3) $s p > s p^{2} > s p^{3}$ (4) $s p < s p^{2} > s p^{3}$ 76. $Which of the following statements is correct?$ (1) $Cl_{2} oxidises H_{2} O to O_{2} but F_{2} does not.$ (2) $Cl_{2} is a stronger oxidising agent than F_{2} .$ (3) $F_{2} oxidises H_{2} O to O_{2} but Cl_{2} does not.$ (4) $Fluoride is a good oxidising agent.$ 77. $Taking stability as the factor, which one of the following represents correct relationship?$ (1) $TlI > TII_{3}$ (2) $TlCl_{3} > TlCl$ (3) $InI_{3} > InI$ (4) $AlCl > AlCl_{3}$ 78. $On heating compound (A) gives a gas (B) which is a constituent of air. This gas when treated with H_{2} in the presence of a catalyst gives another gas (C) which is basic in nature. (A) should not be:$ (1) $Pb (N O_{3})_{2}$ (2) $(N H_{4})_{2} C r_{2} O_{7}$ (3) $N H_{4} N O_{2}$ (4) $Na N_{3}$ 79. $The hydride that is NOT electron deficient is:$ (1) $SiH_{4}$ (2) $B_{2} H_{6}$ (3) $GaH_{3}$ (4) $AlH_{3}$ 80. $Reaction of sodium thiosulphate with iodine gives$ (1) $tetrathionate ion$ (2) $sulphide ion$ (3) $sulphate ion$ (4) $sulphite ion.$ 81. $Given below are two statements : Statement I: Group 13 trivalent halides get easily hydrolyzed by water due to their covalent nature. Statement II: AlCl_{3} upon hydrolysis in acidified aqueous solution forms octahedral (Al (H_{2} O)_{6})^{3 +} ion. In the light of the above statements, choose the correct answer from the options given below :$ (1) $Statement I is true but statement II is false$ (2) $Statement I is false but statement II is true$ (3) $Both statement I and statement II are false$ (4) $Both statement I and statement II are true$ 82. $The acidic, basic and amphoteric oxides, respectively, are$ (1) $MgO, P_{4} O_{10}, A l_{2} O_{3}$ (2) $N_{2} O_{3}, L i_{2} O, A l_{2} O_{3}$ (3) $S O_{3}, A l_{2} O_{3}, N a_{2} O$ (4) $P_{4} O_{10}, A l_{2} O_{3}, MgO$ 83. $Which of the following statement is not correct for nitrogen?$ (1) $Its electronegativity is very high.$ (2) $d ‐orbitals are available for bonding.$ (3) $It is a typical non‐metal.$ (4) $Its molecular size is small.$ 84. $A solution of potassium bromide is treated with each of the following. Which one would liberate bromine?$ (1) $Hydrogen iodide$ (2) $Sulphur dioxide$ (3) $Chlorine$ (4) $Iodine$ 85. $It is possible to obtain oxygen from air by fractional distillation because$ (1) $oxygen is in a different group of the periodic table from nitrogen$ (2) $oxygen is more reactive than nitrogen$ (3) $oxygen has higher b.p. than nitrogen$ (4) $oxygen has a lower density than nitrogen.$ 86. $The variation of the boiling points of the hydrogen halides is in the order H F > H I > H B r > H C l . What explains the higher boiling point of hydrogen fluoride?$ (1) $There is strong hydrogen bonding between HF molecules.$ (2) $The bond energy of HF molecules is greater than in other hydrogen halides.$ (3) $The effect of nuclear shielding is much reduced in fluorine which polarises the HF molecule.$ (4) $The electronegativity of fluorine is much higher than for other elements in the group.$ 87. $Identify the element having positive electron gain enthalpy,$ (1) $Ne$ (2) $I$ (3) $S$ (4) $O$ 88. $Which one of the following molecular hydrides acts as a Lewis acid?$ (1) $N H_{3}$ (2) $H_{2} O$ (3) $B_{2} H_{6}$ (4) $C H_{4}$ 89. $The correct order of the oxidation states of nitrogen in NO, N_{2} O, NO_{2} and N_{2} O_{3} is:$ (1) $NO_{2} < NO < N_{2} O_{3} < N_{2} O$ (2) $NO_{2} < N_{2} O_{3} < NO < N_{2} O$ (3) $N_{2} O < N_{2} O_{3} < NO < NO_{2}$ (4) $N_{2} O < NO < N_{2} O_{3} < NO_{2}$ 90. $The correct order of melting points of hydrides of group 16 elements is :$ (1) $H_{2} S < H_{2} Se < H_{2} Te < H_{2} O$ (2) $H_{2} O < H_{2} S < H_{2} Se < H_{2} Te$ (3) $H_{2} S < H_{2} Te < H_{2} Se < H_{2} O$ (4) $H_{2} Se < H_{2} S < H_{2} Te < H_{2} O$