Chemical Bonding PYQs Set 10 (PDF)

Set 10 of 19 · Questions 271-300 of 568

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Mere Teacher · Previous Year Questions JEE Main Chemistry · Chemical Bonding · Set 10 (Q271-300)
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271. $Which contain at least one e^{-} in σ2p bonding MO$ (1) $O_{2}$ (2) $B_{2}$ (3) $C_{2}$ (4) $L i_{2}$ 272. $Consider the following species: C N^{+}, CN, NO and C N^{-} . Which one of these will have the highest bond order?$ (1) $NO$ (2) $C N^{-}$ (3) $C N^{+}$ (4) $CN$ 273. $Which of the following is isoelectronic?$ (1) $C O_{2}, N O_{2}$ (2) $N O_{2}^{-}, C O_{2}$ (3) $C N^{-}, CO$ (4) $S O_{2}, C O_{2}$ 274. $The incomplete Lewis representation of CO_{3}^{2 -} is given below. The formal charge on atoms marked as a, b, and c, respectively, are$ (1) $a : 0 b : 0 c : - 1$ (2) $a : 0 b : - 2 c : 0$ (3) $a : - 2 b : 0 c : 0$ (4) $a : 0, b : - 1 c : - 1$ 275. $Bond angle in PH_{4}^{+} is more than that of PH_{3} . This is because$ (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) $lone pair - bond pair repulsion exists in PH_{3} .$ 276. $The molecules having square pyramidal geometry are$ (1) $BrF_{5} & PCl_{5}$ (2) $SbF_{5} & PCl_{5}$ (3) $SbF_{5} & XeOF_{4}$ (4) $BrF_{5} & XeOF_{4}$ 277. $Right order of dissociation energy N_{2} and N_{2}^{+} is$ (1) $N_{2} > N_{2}^{+}$ (2) $N_{2} = N_{2}^{+}$ (3) $N_{2}^{+} > N_{2}$ (4) $none$ 278. $How many (i) sp² hybridised carbon atoms and (ii) π bonds are present in the following compound? C_{6} H_{5} -C \equiv C-COOCH_{3}$ (1) $8,6$ (2) $7,6$ (3) $8,5$ (4) $7,5$ 279. $The potential energy (y) curve for H_{2} formation as a function of internuclear distance (x) of the H atoms is shown below. The bond energy of H_{2} is$ (1) $(c - a) 2$ (2) $(b - a) 2$ (3) $(c - a)$ (4) $(b - a)$ 280. $The decreasing order of bond angle in the following molecules is$ (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) $H_{2} O > NH_{3} > CH_{4}$ 281. $The correct statement(s) regarding, (i) HClO, (ii) H C l O_{2}, (iii) H C l O_{3} and (iv) H C l O_{4} is(are)$ (1) $The number of Cl=O bonds in (ii) and (iii) together is two$ (2) $The number of lone pairs of electrons on Cl in (ii) and (iii) together is three$ (3) $The hybridization of Cl in (iv) is s p^{3}$ (4) $Amongst (i) to (iv), the strongest acid is (i)$ 282. $Hybridization of positively charged and negatively charged carbons of the following respectively are$ (1) $sp^{2}, sp$ (2) $sp^{2}, sp^{2}$ (3) $sp^{3}, sp^{3}$ (4) $sp^{3}, sp^{2}$ 283. $A molecule with the formula AX_{4} Y has all it's elements from p-block. Element A is rarest, monoatomic, non-radioactive from its group and has the lowest ionization enthalpy value among A, X and Y. Elements X and Y have first and second highest electronegativity values respectively among all the known elements. The shape of the molecule is:$ (1) $Pentagonal planar$ (2) $Square pyramidal$ (3) $Trigonal bipyramidal$ (4) $Octahedral$ 284. $Which one of the following formulae does not correctly represent the bonding capacities of the two atoms involved?$ (1) $[H - P (H) (H) - H]^{+}$ (2) $F - O - F$ (3) $O \leftarrow N (= O) - O - H$ (4) $H - C = C (= O) - O - H$ 285. $The pair of species having identical shapes for molecules of both species is$ (1) $C F_{4}, S F_{4}$ (2) $X e F_{2}, C O_{2}$ (3) $B F_{3}, P C l_{3}$ (4) $P F_{5}, I F_{5} .$ 286. $The compound(s) with TWO lone pairs of electrons on the central atom is(are).$ (1) $B r F_{5}$ (2) $C l F_{3}$ (3) $X e F_{4}$ (4) $S F_{4}$ 287. $In which of the following the maximum number of lone pairs is present on the central atom ?$ (1) $[C l O_{3}]^{-}$ (2) $X e F_{4}$ (3) $S F_{4}$ (4) $I_{3}^{-}$ 288. $Identify the species having one -bond and maximum number of canonical forms from the following :$ (1) $S O_{3}$ (2) $O_{2}$ (3) $S O_{2}$ (4) $C O_{3}^{2 -}$ 289. $According to MO theory which of the lists ranks the nitrogen species in terms of increasing bond order?$ (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) $N_{2}^{-} < N_{2} < N_{2}^{2 -}$ 290. $Choose the polar molecule from the following:$ (1) $CCl_{4}$ (2) $CO_{2}$ (3) $CH_{2} = CH_{2}$ (4) $CHCl_{3}$ 291. $The hybridizations of atomic orbitals of nitrogen in N O_{2}^{+}, N O_{3}^{-} and N H_{4}^{+} respectively are$ (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) $s p^{2}, s p and s p^{3}$ 292. $The bond dissociation energy of B-F in B F_{3} is 646 kJ m o l^{-1} whereas that of C-F in C F_{4} is 515 kJ m o l^{-1} . The correct reason for higher B-F bond dissociation energy as compared to that of C-F is :$ (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) $smaller size of B-atom as compared to that of C-atom.$ 293. $Which of the following ions has tetrahedral geometry and s p^{3} -hybridisation for its central atom?$ (1) $BH_{4}^{-}$ (2) $NH_{2}^{-}$ (3) $CO_{3}^{2 -}$ (4) $H_{3} O^{+}$ 294. $The shapes of BrF_{5} and XeF_{4}, respectively are$ (1) $square pyramid, square pyramid$ (2) $square planar, square planar$ (3) $square planar, square pyramid$ (4) $square pyramid, square planar$ 295. $The formal charges on the atoms marked as (1) to (4) in the Lewis representation of HNO_{3} molecule respectively are$ (1) $0, 0, - 1, + 1$ (2) $0, - 1, 0, + 1$ (3) $+ 1, 0, 0, - 1$ (4) $0, + 1, 0, - 1$ 296. $In which of the following pairs of molecules/ ions, the central atoms have s p^{2} hybridisation?$ (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) $B F_{3} and N H_{2}^{-}$ 297. $Select the compound from the following that will show intramolecular hydrogen bonding.$ (1) $H_{2} O$ (2) $NH_{3}$ (3) $C_{2} H_{5} OH$ (4) $2-nitrophenol$ 298. $The maximum number of lone pairs of electron on the central atom from the following species is...... C 1 O_{3} -, X e F_{4}, S F_{4} and I_{3} -$ 299. $The number of molecules/ions that show linear geometry among the following is SO_{2}, BeCl_{2}, CO_{2}, N_{3}^{-}, NO_{2}, F_{2} O, XeF_{2}, NO_{2}^{+}, I_{3}^{-}, O_{3}$ 300. $The sum of lone pairs present on the central atom of the interhalogen I F_{5} and I F_{7} is______$