p-Block Elements PYQs Set 6 (PDF)

Set 6 of 14 · Questions 151-180 of 400

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Mere Teacher · Previous Year Questions NEET Chemistry · p-Block Elements · Set 6 (Q151-180)
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151. $Bond dissociation energy of E-H bond of the " H_{2} E" hydrides of group 16 elements (given below), follows order. (A) O (B) S (C) Se (D) Te$ (1) $A>B>C>D$ (2) $A>B>D>C$ (3) $B > A > C > D$ (4) $D > C > B > A$ 152. $Which of the following does not show electrical conduction?$ (1) $Diamond$ (2) $Graphite$ (3) $Potassium$ (4) $Sodium$ 153. $The incorrect statement among the following is options_{1} .$ (1) $PH_{3} shows lower proton affinity than NH_{3} .$ (2) $SO_{2} can act as an oxidizing agent, but not as a reducing agent.$ (3) $PF_{3} exists but NF_{5} does not.$ (4) $NO_{2} can dimerise easily.$ 154. $Noble gases are named because of their inertness towards reactivity. Identify an incorrect statement about them.$ (1) $Noble gases have very high melting and boiling points$ (2) $Noble gases have weak dispersion forces$ (3) $Noble gases have large positive values of electron gain enthalpy$ (4) $Noble gases are sparingly soluble in water$ 155. $In which of the following arrangements the given sequence is not strictly according to the property indicated against it?$ (1) $H F < H C l < H B r < H I : increasing acidic strength$ (2) $H_{2} O < H_{2} S < H_{2} S e < H_{2} T e : increasing p K_{a} values$ (3) $N H_{3} < P H_{3} < A s H_{3} < S b H_{3} : increasing acidic character$ (4) $C O_{2} < S i O_{2} < S n O_{2} < P b O_{2} : increasing oxidising power$ 156. $The reaction in which the hybridization of the underlined atom is affected is$ (1) $XeF_{4} + Sb F_{5} \to$ (2) $H_{2} SO_{4} + NaCl 420 K$ (3) $H_{3} P O_{2} Disproportionation$ (4) $NH_{3} H^{+}$ 157. $Which of the following fluorides does not exist?$ (1) $N F_{5}$ (2) $P F_{5}$ (3) $A s F_{5}$ (4) $S b F_{5}$ 158. $Which one of the following elements is unable to form M F_{6}^{3 -} ion?$ (1) $Ga$ (2) $Al$ (3) $B$ (4) $In$ 159. $Carbon and silicon belong to (IV) group. The maximum coordination number of carbons in commonly occurring compounds is 4, whereas that of silicon is 6. This is due to$ (1) $availability oflow lying d ‐orbitals in silicon$ (2) $large size of silicon$ (3) $more electropositive nature of silicon$ (4) $both (b) and (c).$ 160. $Reaction of ammonia with excess Cl_{2} gives$ (1) $NH4Cland HCl$ (2) $NCl3and HCL$ (3) $NC l_{3} and N H_{4} Cl$ (4) $N H_{4} Cl and N_{2}$ 161. $The difference between electron gain enthalpies will be maximum between :$ (1) $Ne and F$ (2) $Ar and F$ (3) $Ne and Cl$ (4) $Ar and Cl$ 162. $Aqua regiais used for dissolving noble metals (Au, Pt, etc.). The gas evolved in this process is$ (1) $NO$ (2) $N_{2}$ (3) $N_{2} O_{5}$ (4) $N_{2} O_{3}$ 163. $Which of the following compound is added to the sodium extract before addition of silver nitrate for testing of halogens ?$ (1) $Nitric acid$ (2) $Sodium hydroxide$ (3) $Hydrochloric acid$ (4) $Ammonia$ 164. $The element that does NOT show catenation is:$ (1) $Ge$ (2) $Si$ (3) $Sn$ (4) $Pb$ 165. $Which of the following oxide is amphoteric?$ (1) $S n O_{2}$ (2) $C a O$ (3) $S i O_{2}$ (4) $C O_{2}$ 166. $Which ordering of compounds is according to the decreasing order of the oxidation state of nitrogen?$ (1) $H N O_{3}, NO, N H_{4} Cl, N_{2}$ (2) $H N O_{3}, NO, N_{2}, N H_{4} Cl$ (3) $H N O_{3}, N H_{4} Cl, NO, N_{2}$ (4) $NO, H N O_{3}, N H_{4} Cl, N_{2}$ 167. $Match List-I with List-I Name of reaction A. Hell-Volhard Zelinsky reaction B. Iodoform reaction C. Etard reaction D. Gatterman Koch reaction List-II Reagent used I. NaOH+ I_{2} II. (i) C r O 2 C l_{2}, C S_{2} (ii) H_{2} O III. (i) B r_{2} /red phosphorus (ii) H_{2} O IV. CO, HCl, anhyd. A l C l_{3} Choose the correct answer from the options given below:$ (1) $A-III; B-I; C-II; D-IV$ (2) $A-I; B-II; C-III; D-IV$ (3) $A-III; B-II; C-I; D-IV$ (4) $A -III; B-I; C-IV; D-II$ 168. $Compound A used as a strong oxidizing agent is amphoteric in nature. It is the part of lead storage batteries. Compound is :$ (1) $P b_{3} O_{4}$ (2) $Pb O_{2}$ (3) $PbS O_{4}$ (4) $PbO$ 169. $The order of solubility of lithium halides in non-polar solvents follows the order :$ (1) $LiI > LiBr > LiCl > LiF$ (2) $LiF > LiI > LiBr > LiCl$ (3) $LiCl > LiF > LiI > LiBr$ (4) $LiBr > LiCl > LiF > LiI$ 170. $Which is the strongest acid in the following?$ (1) $H C l O_{4}$ (2) $H_{2} S O_{3}$ (3) $H_{2} S O_{4}$ (4) $H C l O_{3}$ 171. $Given below are two statements : Statement -I :The pentavalent oxide of group- 15 element. E_{2} O_{5} . is less acidic than trivalent oxide. E_{2} O_{3} . of the same element. Statement -II :The acidic character of trivalent oxide of group 15 elements. E_{2} 0_{3} . decreases down the group. choose most appropriate answer from the options given below :$ (1) $Both Statement I and Statement II are true.$ (2) $Both Statement I and Statement II are false.$ (3) $Statement I true, but statement II is false.$ (4) $Statement I is false but statement II is true.$ 172. $N a^{+}, M g^{2 +}, A 1^{3 +} and S i^{4 +} are isoelectronic, their ionic size will follow the order$ (1) $N a^{+} > M g^{2 +} < A l^{3 +} < S i^{4 +}$ (2) $N a^{+} < M g^{2 +} < A l^{3 +} < S i^{4 +}$ (3) $N a^{+} > M g^{2 +} > A l^{3 +} > S i^{4 +}$ (4) $N a^{+} ⟨ M g^{2 +} ⟩ A l^{3 +} < S i^{4 +}$ 173. $Given below are two statements: Statement I : The chlorides of Be and Al have Cl-bridged structure. Both are soluble in organic solvents and act as Lewis bases. Statement II: Hydroxides of Be and Al dissolve in excess alkali to give beryllate and aluminate ions. Choose the correct answer from the options given below.$ (1) $Both statement I and Statement II are true$ (2) $Both statement I and Statement II are false$ (3) $Statement I is true but Statement II is false$ (4) $Statement I is false but Statement II is true$ 174. $The main oxides formed on combustion of Li, Na and K in excess of air are, respectively:$ (1) $L i O_{2}, N a_{2} O_{2} and K_{2} O$ (2) $L i_{2} O_{2}, N a_{2} O_{2} and K O_{2}$ (3) $L i_{2} O, N a_{2} O_{2} and K O_{2}$ (4) $L i_{2} O, N a_{2} O and K O_{2}$ 175. $The correct order of N-compounds in its decreasing order of oxidation states is$ (1) $H N O_{3}, NO, N_{2}, N H_{4} Cl$ (2) $N H_{4} Cl, N_{2}, NO, H N O_{3}$ (3) $H N O_{3}, N H_{4} Cl, NO, N_{2}$ (4) $H N O_{3}, NO, N H_{4} Cl, N_{2}$ 176. $Which of the following statements is not true for halogens ?$ (1) $All form monobasic oxyacids$ (2) $Chlorine has the highest electron gain enthalpy$ (3) $All but except fluorine show positive oxidation states$ (4) $All are oxidizing agents$ 177. $Which of the following statements about H_{3} B O_{3} is not correct?$ (1) $It has a layer structure in which planar B O_{3} units are joined by hydrogen bonds.$ (2) $It does not act as proton donor but acts as a Lewis acid by accepting hydroxyl ion.$ (3) $It is a strong tribasic acid.$ (4) $It is prepared by acidifying an aqueous solution of borax.$ 178. $Given below are the pairs of group 13 elements showing their relation in terms of atomic radius. (B < Al), (Al < Ga), (Ga < In) and (In < Tl) Identify the elements present in the incorrect pair and in that pair find out the element (X) that has higher ionic radius (M^{3 +}) than the other one. The atomic number of the element (X) is$ (1) $49$ (2) $81$ (3) $31$ (4) $13$ 179. $Regarding the hydrides of group 15 elements EH_{3} (E = N, P, As, Sb), select the correct statement from the following:(A) The stability of hydrides decreases down the group.(B) The basicity of hydrides decreases down the group.(C) The reducing character increases down the group.(D) The boiling point increases down the group. Choose the correct answer from the options given below:$ (1) $B & C only$ (2) $A, B, C & D$ (3) $A & D only$ (4) $A, B & C only$ 180. $Which of the following has the highest dipole moment?$ (1) $S b H_{3}$ (2) $A s H_{3}$ (3) $N H_{3}$ (4) $P H_{3}$