Chemical Bonding PYQs Set 15 (PDF)

Set 15 of 17 · Questions 421-450 of 508

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Mere Teacher · Previous Year Questions NEET Chemistry · Chemical Bonding · Set 15 (Q421-450)
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421. $Which one of the following conversions involve change in both hybridization and shape?$ (1) $CH_{4} \to C_{2} H_{6}$ (2) $NH_{3} \to NH_{4}^{}$ (3) $BF_{3} \to BF_{4}$ (4) $H_{2} O \to H_{3} O^{+}$ 422. $Which of the alkaline earth metal halides given below is essentially covalent in nature?$ (1) $S r C l_{2}$ (2) $C a C l_{2}$ (3) $B a C l_{2}$ (4) $M g C l_{2}$ 423. $How many of the following species have the bond order 2 ? C_{2}, B_{2}^{2 -}, N_{2}^{2 +}, CN^{+}, NO^{-}, O_{2}, C_{2}^{+}$ (1) $3$ (2) $4$ (3) $6$ (4) $5$ 424. $Assertion: Among the carbon allotropes, diamond is an insulator, Whereas, graphite is a good conductor of electricity. Reason: Hybridization of carbon in diamond and graphite are s p^{3} and s p^{2}, respectively.$ (1) $Both assertion and reason are correct, but the reason is not the correct explanation for the assertion.$ (2) $Assertion is incorrect statement, but the reason is correct.$ (3) $Both assertion and reason are correct, and the reason is the correct explanation for the assertion.$ (4) $Both assertion and reason are incorrect.$ 425. $Which one of the following does not have a pyramidal shape?$ (1) $(C H_{3})_{3} N$ (2) $(S i H_{3})_{3} N$ (3) $P (C H_{3})_{3}$ (4) $P (S i H_{3})_{3}$ 426. $Predict the correct order among the following :$ (1) $Ione pair - bond pair > bond pair - bond pair > lone pair - lone pair$ (2) $lone pair - lone pair > lone pair - bond pair > bond pair - bond pair$ (3) $lone pair - lone pair > bond pair - bond pair > lone pair - bond pair$ (4) $bond pair - bond pair > lone pair - bond pair > lone pair - lone pair$ 427. $The hybridisation of C in diamond, graphite and ethyne is in the order$ (1) $s p^{3}, sp, s p^{2}$ (2) $s p^{3}, s p^{2}, sp$ (3) $sp, s p^{2}, s p^{3}$ (4) $s p^{2}, s p^{3}, sp$ 428. $Among the following, the true statements are I. P H_{5} and B i C l_{5} donot exist. II. pπ-dπ is present in S O_{2} . III. Electrons travel with speed of light. IV. S F_{4} and C H_{4} has same shape V. I_{3}^{+} has bent shape.$ (1) $I, III$ (2) $I, II, V$ (3) $I, III, V$ (4) $I, II, IV$ 429. $Which of the following compounds contain(s) no covalent bond(s)? KCl, P H_{3}, O_{2}, B_{2} H_{6}, H_{2} S O_{4}$ (1) $KCl$ (2) $KCl, B_{2} H_{6}$ (3) $KCl, B_{2} H_{6}, P H_{3}$ (4) $KCl, H_{2} S O_{4}$ 430. $In X - H - - - Y, X and Y both are electronegative elements. Then$ (1) $electron density on X will increase and on H will decrease$ (2) $in both electron density will increase$ (3) $in both electron density will decrease$ (4) $on X electron density will decrease and on H increases.$ 431. $Correct or der of increasing C—O bond length of CO, C O_{3}^{2 -}, CO2 is :$ (1) $C O_{3}^{2 -} < CO2 < CO$ (2) $CO2 < C O_{3}^{2 -} < CO$ (3) $CO < C O_{3}^{2 -} < CO2$ (4) $CO < CO2 < C O_{3}^{2 -}$ 432. $The bond order and the magnetic characteristics of C N^{-} are :$ (1) $2 \frac{1}{2}, diamagnetic$ (2) $3, paramagnetic$ (3) $3, diamagnetic$ (4) $2 \frac{1}{2}, paramagnetic$ 433. $Which of the following possess net dipole moment?$ (1) $SO_{2}$ (2) $BF_{3}$ (3) $BeCl_{2}$ (4) $CO_{2}$ 434. $The intermolecular interaction that is dependent on the inverse cube of distance between the molecules is:$ (1) $ion-ion interaction$ (2) $ion-dipole interaction$ (3) $London force$ (4) $hydrogen bond$ 435. $The correct statement with regard to H_{2}^{+} and H_{2}^{-} is$ (1) $both H_{2}^{+} and H_{2}^{-} do not exist$ (2) $H_{2}^{-} is more stable than H_{2}^{+}$ (3) $H_{2}^{+} is more stable than H_{2}^{-}$ (4) $both H_{2}^{+} and H_{2}^{-} are equally stable.$ 436. $The hydride that is NOT electron different is:$ (1) $G a H_{3}$ (2) $S i H_{4}$ (3) $A l H_{3}$ (4) $B_{2} H_{6}$ 437. $The intramolecular hydrogen bond is present in$ (1) $phenol$ (2) $o-nitrophenol$ (3) $p-nitrophenol$ (4) $p -cresol.$ 438. $Arrange the following in the increasing order of their bond order O_{2}, O_{2}^{+}, O_{2}^{-} and O_{2}^{2 -}$ (1) $O_{2}^{2 -}, O_{2}^{-}, O_{2}^{+}, O_{2}$ (2) $O_{2}^{+}, O_{2}, O_{2}^{-}, O_{2}^{2 -}$ (3) $O_{2}, O_{2}^{+}, O_{2}^{- ’}, O_{2}^{2 -}$ (4) $O_{2}^{2 -}, O_{2}^{-}, O_{2}, O_{2}^{+}$ 439. $Which of the following species contains three bond pairs and one lone pair around the central atom ?$ (1) $H2O$ (2) $BF3$ (3) $NH2-$ (4) $PCl3$ 440. $The bond angle H-X-H is the greatest in the compound:$ (1) $N H_{3}$ (2) $P H_{3}$ (3) $C H_{4}$ (4) $H_{2} O$ 441. $Which one of the following molecules is paramagnetic?$ (1) $N_{2}$ (2) $NO$ (3) $CO$ (4) $O_{3}$ 442. $In formation of N O^{+} from NO, the electron is removed from$ (1) $a σ-orbital$ (2) $a π-orbital$ (3) $a σ-orbital$ (4) $a π*-orbital$ 443. $The potential energy curve for the H_{2}, molecule as a function of inter-nuclear distance is$ (1) (2) (3) (4) 444. $The state of hybrid orbitals of carbon in CO_{2}, CH_{4} and CO_{3}^{2 -} respectively is$ (1) $s p^{3}, s p^{2} and sp$ (2) $sp, s p^{3} and s p^{2}$ (3) $s p^{3}, sp and s p^{2}$ (4) $s p^{2}, s p^{3} and sp.$ 445. $In the structure of S F_{4}, the lone pair of electrons on S is in.$ (1) $equatorial position and there are two lone pairbond pair repulsions at 90°$ (2) $equatorial position and there are three lone pair-bond pair repulsions at 90°$ (3) $axial position and there are three lone pair -bond pair repulsion at 90°.$ (4) $axial position and there are two lone pair -bond pair repulsion at 90°.$ 446. $In X e O_{3} F_{2}, the number of bond pair(s), π-bond(s) and lone pair(s) on Xe atom respectively are:$ (1) $5, 2, 0$ (2) $4, 2, 2$ (3) $5, 3, 0$ (4) $4, 4, 0$ 447. $Which of the following conversions involves change in both shape and hybridization?$ (1) $H_{2} O \to H_{3} O^{+}$ (2) $B F_{3} \to B F_{4}^{-}$ (3) $C H_{4} \to C_{2} H_{6}$ (4) $N H_{3} \to N H_{4}^{+}$ 448. $The number of lone pairs on Xe in X e F_{2}, X e F_{4} and X e F_{6} respectively are :$ (1) $3, 2, 1$ (2) $2, 4, 6$ (3) $1, 2, 3$ (4) $6, 4, 2$ 449. $Which of the following pairs contains 2 lone pairs of electrons on the central atom?$ (1) $I_{3}^{+}, H_{2} O$ (2) $XeF_{4}, NH_{3}$ (3) $H_{2} O, NF_{3}$ (4) $SO_{4}^{2 -}, H_{2} S$ 450. $Which of the following molecule has the maximum dipole moment?$ (1) $NH_{3}$ (2) $CS_{2}$ (3) $C_{2} H_{6}$ (4) $NCl_{3}$