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1 Hydrogen Bond 1. The states of hybridization of boron and oxygen atoms in boric acid (H BO ) are reectively (A) and (B) and (C) and (D) and. The correct order of the hybridization of the central atom in the following ecies NH, [PtCl ], PCl 5 and BCl [001] (A) d, d, and (B), d, d, (C) d,,, d (D) d,,, d. Specify the coordination geometry around and hybridization of N and B atoms in a 1: 1 complex of BF and NH [00] (A) N: tetrahedral, ; B: tetrahedral, (B) N: pyramidal, ; B: pyramidal, (C) N: pyramidal, ; B: planar, (D) N: pyramidal, : tetrahedral,. The linear structure is assumed by: [1991] (A) SnCl (B) NH (C) CO (D) NO 5. Which of the following statements are correct? (A) The bond angle of NCl is greater than that of NH. (B) The bond angle in PH is greater than that of PF. (C) And are isostructural (D) It is not necessary that in TBP structure the lone pairs always would occupy the equatorial positions.
2 5. The geometry of H S and its dipole moment are [1999] (A) Angular and non-zero (C) Linear and non-zero (B) Angular and zero (D) Linear and zero 7. The bond order in NO is.5 while that in NO + is. Which of the following statements is true for these two ecies? (A) Bond length in NO + is equal to that in NO (B) Bond length in NO is greater than in NO + (C) Bond length in NO + is greater than in NO (D) Bond length is unpredictable 8. Which of the following molecules/ions does not contain unpaired electrons? (A) N + (B) O (C) O (D) B 9. The cyanide ion, CN and N are isoelectronic. But in contrast to CN, N is chemically inert, because of [199] (A) Low bond energy (B) Absence of bond polarity (C) Unsymmetrical electron distribution (D) Presence of more number of electrons in bonding orbitals 10. Among KO, AlO, BaO and NO +, unpaired electron is present in (A) NO + and BaO (B) KO and AlO (C) KO only (D) BaO only [1997]
3 11. The correct order of increasing C O bond length of CO, CO, CO is [1999] a) CO CO CO b) CO CO CO c) CO CO CO d) CO CO CO 1. The common features among the ecies CN, CO and NO + are [001] a) Bond order three and isoelectronic b) Bond order three and weak field ligands c) Bond order two and -acceptors d) Isoelectronic and weak field ligands 1. Which of the following are isoelectronic and isosteructural? NO, CO, SO [00] a) NO, CO b) SO, NO c) ClO, CO d) CO, SO 1. Among the following, the paramagnetic compound is [007] a) Na O b) O c) N O d) KO 15. The ecies having bond order different from that in CO is [007] a) NO b) NO + c) CN d) N 16. Planar structure is shown by [AIIMS007] a) CO b) BCl c) N(SiH ) d)all 17. Which of the following does not have a co ordinate covalent bond? [CPMT008] a) SO b) H N O c) H SO d) HNO 18. In which of the following, the central atob does not have Sp hybridisation? [AIPMT010] a. CH b. SF c. BF d. NH +
4 19. Which of the following is Linear? [AFMC008] a. XeF b. XeF c. SO d. ClF 0. Among the following molecules, SO, ClF, XeF, SF Which of the following does not describe the shape of any of these is [AIPMT011] a. Bent b. Trigonal bi pyramidal c. See-saw d. T-shape 1. The shape of NH molecule is (CPMT 000: AIIMS001) a. Pyramidal b. Linear c. Tetrahedral d. Trigonal. The shape of I F 5 is a. Pentagonal bipyramidal b. Square pyramidal c. Octahedral d. Trigonal planar (CPMT001). The As F 5 molecule is trigonal pyramidal The hybrid orbital used by the As-atom for bonding are a. d, s, p x y y, p z b. s, px, py, pz, d z c. x y z d, d, s, px, p y d. d, s, p, p, p xy x y z (AIIMS000). Ion which of the following the angle between the two covalent bonds is greatest? [JIPMER 001] a. H O b. NH c. CH d. CO 5. BCl is a planar molecule because its hybridization is: [BHU 000] a. SP b. Sp d c. Sp d. Sp 6. The ratio of and bonds in benzene is [BHU 000] a. 1: b. 1: c. 1:6 d. 1:9 7. Which of the following molecules will form a linear polymeric structure due to hydrogen bonding? [AIPMT 000] a. NH b. H O c. HCl d. HF
5 8. Which of the following is not a paramagnetic? [AIPMT 000] a. NO b. N c. CO d. O 9. Which of the following two are isostructural? [AIPMT 001][BHU 007] a. XeF, IF b. NH, BF c. CO, SO d. PCl5, ICI 5 0. In which of the following bond angle is maximum? [AIPMT 001] a. NH b. NH c. PCl d. SCl 1. Which of the following has p d bonding? [AIPMT 00] a. No b. So c. Bo d.. The number of and -bonds present in 1-buten--yne are Co [AFMC 000] a. 7 and 5 b. 6 and c. 6 and 6 d. 7 and. Both BF and NF are covalent but BF molecule is non-polar while NF is polar because [AFMC 001] a. Boron is a metal while nitrogen is a gas b. BF is a planar but NF is pyramidal c. Atomic size of boron is smaller than nitrogen d. B-F bond has no dipole moment while N-F bond has dipole moment. NH is added to BF by [AFMC 001] a. Ionic Bond b. Covalent bond c. Dative bond d. Molecular bond 5. Ionic bond formation between Aand B can take place only if [AFMC 001] a. Ionization energy of A is less and electron affinity of B is more. b. If ionisation energy of both A and B are more. c. Both have equal electron affinities. d. None of the above.
6 6. Ethane molecule contains [AMU 000] a. One -bond and five -bonds b. Two -bonds only c. Two -bonds and four -bonds d. Four -bonds and -bonds 7. Which of the following ecies is diamagnetics? [AMU 001] a. O b. O c. O d. O 8. MO configuration of He is [AMU 001] 1 a. 1s 1s s b. 1s 1s s 1 c. 1s 1s s d. 1s 1s s The orbitals of same energy level providing the most efficient overlapping are [PMT (HARYANA) 000] a. - b. c. 0. What is the correct sequence of bond order? a. O O O b. O O O c. O O O 1. The number of d. O O O d. All of the these [PMT (HARYANA) 000; BHU 00] SP - hybrid carbons in - butyne is [PMT (HARYANA) 001] a. 1 b. c. d.. Anti bonding molecular orbital is formed by (DPMT 000) a. Addition of wave function of atomic orbitals b. Subtraction of wav e functions of atomic orbitals. c. Multiplication of wave function of atomic orbitals d. None of the above. In Lewis formula of O there are 000) a., 1, lone pairs b. 1,,, 1 lone pairs c.,, lone pairs d., 1, 6 lone pairs (DPMT
7 . The number possible resonating structures for CO ion is [PMT (MP) 000] a. 9 b. 6 c. d. 5. The correct order of bond angles in the molecule H O, NH, CH and CO is [PMT (KERALA) 001] a. H O NH CH CO b. H O NH CO CH C. H O NH CH CO d. CO CH NH H O 6. In OF, number of bond pairs and lone pairs of electrons are reectively [DPMT 00] a., 6 b., 8 c., 10 d., 9 7. Which of the following does not contain coordinate bond? a. BH b. NH c. [PMT (RAJASTHAN) 00] CO d. H O 8. Which of the following bonds requires the largest amount of energy to dissociate into the constituent atoms? [PMT (KERALA) 00] a. H H bond in H b. C H Bond in CH c. N N bond in N d. O O Bond in O 9. The ONO angle is maximum in [AIIMS 00] a. NO b. NO c. NO d. NO 50. Which statement is true for N ion? [AIIMS 00] a. It has a non linear structure b. It is called pseudohalogen c. The average oxidation state of N in the ion is -1 d. It is isoelectronic with NO 51. Among the following, the pair in which two ecies are not isostructural is [AIIMS 00]
8 a. SiF and SF b. IO and XeO c. BH and NH d. PF 6 and SF 6 5. In regular octahedral molecule MX 6, the number of XMX bonds at is [AIPMT 00] a. b. c. 6 d. 5. H O is dipolar whereas BeF is not, It is because [AIPMT 00] a. electro negativity of F is greater than that of O b. H O involves H bonding whereas BeF is a discrete unit c. H O is linear and BeF is angular d. H O is angular and BeF is linear 5. In BrF molecule, the lone pairs occupy equatorial position around Br atom to minimize. a. Lone Pair bond pair repulsions only b. Lone Pair lone pair repulsions only[aipmt 00] c. Bond Pair bond pair repulsions only d. Lone Pair bond pair as well as lone pair lone pair repulsions 55. Which hybridizations has sulphur in SO? [PMT (HARYANA) 00] a. b. d c. d. 56. The hybridizations of nitrogen in NO, NO and NH are reectively a., c. and, and b., d. [PMT(HARYANA)005] and and 57. The correct sequence of hybridization of methane, ethane and acetylene is [CPMT 00] a.,, b.,, c.,, d.,, 58. Hybridizations present in CIF is [CPMT 005]
9 a. s d b. c. d d. d 59. Electron deficient molecule is [CPMT 005] a. CCI b. PCl 5 c. BF d. SF The number of and bonds in Allyl Isocyanide are [CH = CH- CH :-NC] [CPMT 006] a. 9, b. 9, 9 c., d. 5, 7 KEY 1) a )b ) a ) c 5)c 6) a 7) d 8) c 9) b 10) c 11) d 1) a 1) a 1) d 15) a 16) d 17) d 18) a 19) b 0) b 1) a ) b ) b ) d 5) c 6) b 7) d 8) c 9) a 0) b 1) b ) d ) b ) c 5) a 6) a 7) b 8) a 9) a 0) a 1) ) b ) d ) c 5) d 6) b 7) c 8) c 9) d 50) b 51) a 5) a 5) d 5) d 55) a 56) b 57) c 58) d 59) c 60) a
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