Chemical Bonding PYQs Set 6 (PDF)

Set 6 of 17 · Questions 151-180 of 508

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Mere Teacher · Previous Year Questions NEET Chemistry · Chemical Bonding · Set 6 (Q151-180)
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151. $Among A l_{2} O_{3}, S i O_{2}, P_{2} O_{3} and S O_{2} the correct order of acid strength is:$ (1) $A l_{2} O_{3} < S i O_{2} < S O_{2} < P_{2} O_{3}$ (2) $S i O_{2} < S O_{2} < A l_{2} O_{3} < P_{2} O_{3}$ (3) $S O_{2} < P_{2} O_{3} < S i O_{2} < A l_{2} O_{3}$ (4) $A l_{2} O_{3} < S i O_{2} < P_{2} O_{3} < S O_{2}$ 152. $Pair of species among the following having same bond order as well as paramagnetic character will be-$ (1) $O_{2}^{-}, N_{2}^{+}$ (2) $O_{2}^{+}, N_{2}^{2 -}$ (3) $O_{2}^{-}, N_{2}^{-}$ (4) $O_{2}^{+}, N_{2}^{-}$ 153. $Main axis of diatomic molecule is z . The orbitals p_{x} and p_{y} overlap to form$ (1) $π -molecular orbital$ (2) $σ -molecular orbital$ (3) $δ -molecular orbital$ (4) $no bond is formed.$ 154. $Based upon VSEPR theory, match the shape (geometry) of the molecules in List-I with the molecules in List-II and select the most appropriate option List-I (Shape) (A) T-shaped (B) Trigonal planar (C) Square planar (D) See-saw List-II (Molecules) (I) X e F_{4} (II) S F_{4} (III) C 1 F_{3} (IV) B F_{3}$ (1) $(A) -I, (B) - (II), (C) - (III), (D) - (IV)$ (2) $(A) - (III), (B) - (IV), (C) - (I), (D) - (II)$ (3) $(A) - (III), (B) - (IV), (C) - (II), (D) - (I)$ (4) $(A) - (IV), (B) - (III), (C) - (I), (D) - (II)$ 155. $Which one shows maximum hydrogen bonding?$ (1) $H_{2} O$ (2) $H S e$ (3) $H_{2} S$ (4) $HF$ 156. $Assuming 2s-2p mixing is NOT operative, the paramagnetic species among the following is:$ (1) $B e_{2}$ (2) $B_{2}$ (3) $C_{2}$ (4) $N_{2}$ 157. $Which of the following does not have triple bond between the atoms?$ (1) $N_{2}$ (2) $CO$ (3) $NO$ (4) $C_{2}^{2 -}$ 158. $Among the following, the CORRECT combinations are(A) IF_{3} \to T -shaped (sp^{3} d)(B) IF_{5} \to Square pyramidal (sp^{3} d^{2}) (C) IF_{7} \to Pentagonal bipyramidal (sp^{3} d^{3}) (D) ClO_{4}^{-} \to Square planar (sp^{2} d) Choose the correct answer from the options given below:$ (1) $(B), (C) and (D) Only$ (2) $A and (B) Only$ (3) $(A), (B) and (C) Only$ (4) $(A), (B), (C) and (D)$ 159. $Which among the following concepts is not introduced by V.B. theory?$ (1) $Partial ionic character of a covalent bond.$ (2) $Number of lone pairs and bond pairs of electrons decide the shape of the molecules.$ (3) $Delocalisation of electrons over two nuclei.$ (4) $Shielding effect of electrons.$ 160. $The bond length between hybridised carbon atom and other carbon atom is minimum in$ (1) $propene$ (2) $propyne$ (3) $propane$ (4) $butane.$ 161. $Observe the following molecules/ions H_{2}, N_{2}, O_{2}, N_{2}^{+}, O_{2}^{+}, O_{2}^{-}, F_{2} . Identify correct statement.$ (1) $H_{2}, N_{2}, O_{2}, F_{2} show diamagnetic property$ (2) $O_{2}, O_{2}^{+}, O_{2}^{-}, N_{2}^{+} show paramagnetic property$ (3) $N_{2}, F_{2}, O_{2}^{+}, O_{2}^{-} show diamagnetic property$ (4) $H_{2}, N_{2}^{+}, O_{2}^{+}, O_{2}^{-} show paramagnetic property$ 162. $If the bond order in C_{2} is ' x' then the bond order in B_{2} and O_{2}, respectively are$ (1) $\frac{1}{2} x, 2 x$ (2) $x, x$ (3) $\frac{1}{2} x, x$ (4) $x, 2 x$ 163. $A metal, M forms chlorides in +2 and +4 oxidation states. Which of the following statements about these chlorides is correct?$ (1) $M C l_{2} is more volatile than M C l_{4}$ (2) $M C l_{2} is more soluble in anhydrous ethanol than M C l_{4}$ (3) $M C l_{2} is more ionic than M C l_{4}$ (4) $M C l_{2} is more easily hydrolyzed than M C l_{4}$ 164. $In CO_{2} molecule, the hybridisations of carbon and oxygen atoms are respectively.$ (1) $Carbon Oxygen sp s p^{2}$ (2) $Carbon Oxygen s p^{2} s p^{2}$ (3) $Carbon Oxygen sp sp$ (4) $Carbon Oxygen s p^{2} s p^{3}$ 165. $Identify the correct order of acidic strengths of C O_{2}, CuO, CaO, H_{2} O.$ (1) $CaO < CuO < H_{2} O < C O_{2}$ (2) $H_{2} O < CuO < CaO < C O_{2}$ (3) $CaO < H_{2} O < CuO < C O_{2}$ (4) $H_{2} O < C O_{2} < CaO < CuO$ 166. $Which one of the following molecules has maximum dipole moment?$ (1) $NF_{3}$ (2) $CH_{4}$ (3) $PF_{5}$ (4) $NH_{3}$ 167. $Identify all the species that do not exist H_{2}^{+}, He_{2}^{2 +}, Li_{2}^{2 -}, Ne_{2}, Be_{2}^{-}, He_{2}$ (1) $He_{2}, Ne_{2} only$ (2) $Li_{2}^{2 -}, Ne_{2}, He_{2} only$ (3) $Be_{2}^{-}, He_{2}, Ne_{2} only$ (4) $H_{2}^{+}, Li_{2}^{2 -} only$ 168. $The correct pair of species with (A) the highest bond order and (B) diamagnetic character is A B$ (1) $O_{2} O_{2}^{+}$ (2) $O_{2}^{+} O_{2}^{2 -}$ (3) $O_{2}^{-} O_{2}$ (4) $O_{2}^{2 -} O_{2}^{+}$ 169. $Using MO theory predict which of the following species has the shortest bond length ?$ (1) $O_{2}^{+}$ (2) $O_{2}^{-}$ (3) $O_{2}^{2-}$ (4) $O_{2}^{2 +}$ 170. $Dipole-induced dipole interactions are present in which of the following pairs :$ (1) $Cl2 and CCl4$ (2) $HCl and He atoms$ (3) $SiF4 and He atoms$ (4) $H2O and alcohol$ 171. $Which of the following molecule does not have a linear arrangement of atoms?$ (1) $H_{2} S$ (2) $C_{2} H_{2}$ (3) $B e_{2}$ (4) $C O_{2}$ 172. $Assuming that Hund's rule is violated, the bond order and magnetic nature of the diatomic molecule B_{2} is:$ (1) $1 and diamagnetic$ (2) $0 and diamagnetic$ (3) $1 and paramagnetic$ (4) $0 and paramagnetic$ 173. $According to molecular orbital theory, which of the following will not be a viable molecule?$ (1) $H_{2}^{-}$ (2) $H_{2}^{2 -}$ (3) $H e_{2}^{2 +}$ (4) $H e_{2}^{+}$ 174. $Two pi and half sigma bonds are present in$ (1) $N_{2}^{+}$ (2) $O_{2}$ (3) $O_{2}^{+}$ (4) $N_{2}$ 175. $In which of the following molecules, all bond lengths are not equal?$ (1) $SF_{6}$ (2) $PCl_{5}$ (3) $BCl_{3}$ (4) $CCl_{4}$ 176. $Which one of the following pairs is an example of polar molecular solids?$ (1) $S O_{2} (s), C O_{2} (s)$ (2) $S O_{2} (s), N H_{3} (s)$ (3) $MgO(s) S O_{2} (s)$ (4) $HCl(s),AlN(s)$ 177. $Which theory can explain bonding of Ni (CO)_{4} :$ (1) $MOT$ (2) $CFT$ (3) $VBT$ (4) $Werner’s theory$ 178. $Which of the following is an incorrect statement?$ (1) $Hydrogen bonding is stronger than dispersion force.$ (2) $Sigma bonds are stronger than π -bonds.$ (3) $Ionic bonding is non-directional.$ (4) $σ -electrons are referred to as mobile electrons.$ 179. $N_{2} and O_{2} are converted into monocations, N_{2}^{+} and O_{2}^{+} respectively. Which is wrong?$ (1) $In O_{2} paramagnetism decreases.$ (2) $N_{2}^{+} becomes diamagnetic.$ (3) $In N_{2}, the NN bond weakens.$ (4) $In O_{2}, the OO bond order increases.$ 180. $Identify a molecule which does not exist.$ (1) $Li_{2}$ (2) $C_{2}$ (3) $O_{2}$ (4) $He_{2}$