Chemical Bonding PYQs Set 9 (PDF)

Set 9 of 17 · Questions 241-270 of 508

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Mere Teacher · Previous Year Questions NEET Chemistry · Chemical Bonding · Set 9 (Q241-270)
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241. $Which of the following species is not paramagnetic?$ (1) $CO$ (2) $O_{2}$ (3) $B_{2}$ (4) $NO$ 242. $The ground state electronic configuration of valence shell electrons in nitrogen molecule (N) is written as K K, σ 2 s^{2}, σ^{*} 2 s^{2}, π 2 p_{x}^{2} = π 2 p_{y}^{2} σ 2 p_{Z}^{2} . Hence the bond order in nitrogen molecule is$ (1) $2$ (2) $3$ (3) $0$ (4) $1$ 243. $Match the List I with List II. List - I Molecule/Ion (A) ICl_{2}^{-} (B) H_{2} O (C) SO_{2} (D) XeF_{4} List - II Bond pair: lone pair (on the central atom) (I) 4:2 (II) 4:1 (III) 2:3 (IV) 2:2 Choose the correct answer from the options given below:$ (1) $A-IV, B-III, C-II, D-I$ (2) $A-III, B-IV, C-I, D-II$ (3) $A-II, B-I, C-IV, D-III$ (4) $A-III, B-IV, C-II, D-I$ 244. $Which contain at least one e^{-} in σ2p bonding MO$ (1) $O_{2}$ (2) $B_{2}$ (3) $C_{2}$ (4) $L i_{2}$ 245. $Consider the following species: C N^{+}, CN, NO and C N^{-} . Which one of these will have the highest bond order?$ (1) $NO$ (2) $C N^{-}$ (3) $C N^{+}$ (4) $CN$ 246. $Which of the following is isoelectronic?$ (1) $C O_{2}, N O_{2}$ (2) $N O_{2}^{-}, C O_{2}$ (3) $C N^{-}, CO$ (4) $S O_{2}, C O_{2}$ 247. $The incomplete Lewis representation of CO_{3}^{2 -} is given below. The formal charge on atoms marked as a, b, and c, respectively, are$ (1) $a : 0 b : 0 c : - 1$ (2) $a : 0 b : - 2 c : 0$ (3) $a : - 2 b : 0 c : 0$ (4) $a : 0, b : - 1 c : - 1$ 248. $Bond angle in PH_{4}^{+} is more than that of PH_{3} . This is because$ (1) $PH_{4}^{+} has square planar structure$ (2) $PH_{3} has planar trigonal structure$ (3) $hybridisation of P changes when PH_{3} is converted to PH_{4}^{+}$ (4) $lone pair - bond pair repulsion exists in PH_{3} .$ 249. $The molecules having square pyramidal geometry are$ (1) $BrF_{5} & PCl_{5}$ (2) $SbF_{5} & PCl_{5}$ (3) $SbF_{5} & XeOF_{4}$ (4) $BrF_{5} & XeOF_{4}$ 250. $Right order of dissociation energy N_{2} and N_{2}^{+} is$ (1) $N_{2} > N_{2}^{+}$ (2) $N_{2} = N_{2}^{+}$ (3) $N_{2}^{+} > N_{2}$ (4) $none$ 251. $How many (i) sp² hybridised carbon atoms and (ii) π bonds are present in the following compound? C_{6} H_{5} -C \equiv C-COOCH_{3}$ (1) $8,6$ (2) $7,6$ (3) $8,5$ (4) $7,5$ 252. $The potential energy (y) curve for H_{2} formation as a function of internuclear distance (x) of the H atoms is shown below. The bond energy of H_{2} is$ (1) $(c - a) 2$ (2) $(b - a) 2$ (3) $(c - a)$ (4) $(b - a)$ 253. $The decreasing order of bond angle in the following molecules is$ (1) $CH_{4} > H_{2} O > NH_{3}$ (2) $NH_{3} > CH_{4} > H_{2} O$ (3) $CH_{4} > NH_{3} > H_{2} O$ (4) $H_{2} O > NH_{3} > CH_{4}$ 254. $Hybridization of positively charged and negatively charged carbons of the following respectively are$ (1) $sp^{2}, sp$ (2) $sp^{2}, sp^{2}$ (3) $sp^{3}, sp^{3}$ (4) $sp^{3}, sp^{2}$ 255. $A molecule with the formula AX_{4} Y has all it's elements from p-block. Element A is rarest, monoatomic, non-radioactive from its group and has the lowest ionization enthalpy value among A, X and Y. Elements X and Y have first and second highest electronegativity values respectively among all the known elements. The shape of the molecule is:$ (1) $Pentagonal planar$ (2) $Square pyramidal$ (3) $Trigonal bipyramidal$ (4) $Octahedral$ 256. $Which one of the following formulae does not correctly represent the bonding capacities of the two atoms involved?$ (1) $[H - P (H) (H) - H]^{+}$ (2) $F - O - F$ (3) $O \leftarrow N (= O) - O - H$ (4) $H - C = C (= O) - O - H$ 257. $The pair of species having identical shapes for molecules of both species is$ (1) $C F_{4}, S F_{4}$ (2) $X e F_{2}, C O_{2}$ (3) $B F_{3}, P C l_{3}$ (4) $P F_{5}, I F_{5} .$ 258. $In which of the following the maximum number of lone pairs is present on the central atom ?$ (1) $[C l O_{3}]^{-}$ (2) $X e F_{4}$ (3) $S F_{4}$ (4) $I_{3}^{-}$ 259. $Identify the species having one -bond and maximum number of canonical forms from the following :$ (1) $S O_{3}$ (2) $O_{2}$ (3) $S O_{2}$ (4) $C O_{3}^{2 -}$ 260. $According to MO theory which of the lists ranks the nitrogen species in terms of increasing bond order?$ (1) $N_{2}^{2 -} < N_{2}^{-} < N_{2}$ (2) $N_{2} < N_{2}^{2 -} < N_{2}^{-}$ (3) $N_{2}^{-} < N_{2}^{2 -} < N_{2}$ (4) $N_{2}^{-} < N_{2} < N_{2}^{2 -}$ 261. $Choose the polar molecule from the following:$ (1) $CCl_{4}$ (2) $CO_{2}$ (3) $CH_{2} = CH_{2}$ (4) $CHCl_{3}$ 262. $The hybridizations of atomic orbitals of nitrogen in N O_{2}^{+}, N O_{3}^{-} and N H_{4}^{+} respectively are$ (1) $s p, s p^{3} and s p^{2}$ (2) $s p^{2}, s p^{3} and s p$ (3) $s p, s p^{2} and s p^{3}$ (4) $s p^{2}, s p and s p^{3}$ 263. $The bond dissociation energy of B-F in B F_{3} is 646 kJ m o l^{-1} whereas that of C-F in C F_{4} is 515 kJ m o l^{-1} . The correct reason for higher B-F bond dissociation energy as compared to that of C-F is :$ (1) $stronger σ bond between B and F in BF3 as compared to that between C and F in CF4.$ (2) $significant pπ-pπ interaction between B and F in BF3 whereas there is no possibility of such interaction between C and F in CF4.$ (3) $lower degree of pπ-pπ interaction between B and F in BF3 than that between C and F in CF4.$ (4) $smaller size of B-atom as compared to that of C-atom.$ 264. $Which of the following ions has tetrahedral geometry and s p^{3} -hybridisation for its central atom?$ (1) $BH_{4}^{-}$ (2) $NH_{2}^{-}$ (3) $CO_{3}^{2 -}$ (4) $H_{3} O^{+}$ 265. $The shapes of BrF_{5} and XeF_{4}, respectively are$ (1) $square pyramid, square pyramid$ (2) $square planar, square planar$ (3) $square planar, square pyramid$ (4) $square pyramid, square planar$ 266. $The formal charges on the atoms marked as (1) to (4) in the Lewis representation of HNO_{3} molecule respectively are$ (1) $0, 0, - 1, + 1$ (2) $0, - 1, 0, + 1$ (3) $+ 1, 0, 0, - 1$ (4) $0, + 1, 0, - 1$ 267. $In which of the following pairs of molecules/ ions, the central atoms have s p^{2} hybridisation?$ (1) $N O_{2}^{-} and N H_{3}$ (2) $B F_{3} and N O_{2}^{-}$ (3) $N H_{2}^{-} and H_{2} O$ (4) $B F_{3} and N H_{2}^{-}$ 268. $Select the compound from the following that will show intramolecular hydrogen bonding.$ (1) $H_{2} O$ (2) $NH_{3}$ (3) $C_{2} H_{5} OH$ (4) $2-nitrophenol$ 269. $Which one of the following contains ionic, covalent and co-ordinate bonds?$ (1) $NaOH$ (2) $NaCl$ (3) $NaCN$ (4) $NaNC$ 270. $The angular shape of ozone molecule (O3) consists of$ (1) $1 sigma and 2 π bonds$ (2) $2 sigma and 1 π bonds$ (3) $1 sigma and 1 π bonds$ (4) $2 sigma and 2 π bonds$