Chemical Bonding and Molecular Structure - Structure and Bonding - Life Sciences Previous Year Questions

1

2007 · Life Sciences · Structure and Bonding · Chemical Bonding and Molecular Structure

Life Sciences (XL) 2007

On the basis of VSEPR theory, the molecule which has a linear structure is

A

SO₂

B

N₂O

C

Cl₂O

D

NO₂

Open complete paper

2

2007 · Life Sciences · Structure and Bonding · Chemical Bonding and Molecular Structure

Life Sciences (XL) 2007

The electron-deficient molecule is

A

N₂H₄

B

C₂H₆

C

B₂H₆

D

O₂H₂

Open complete paper

3

2007 · Life Sciences · Structure and Bonding · Chemical Bonding and Molecular Structure

Life Sciences (XL) 2007

The most stable geometry of BrF5 is

A

Square pyramidal (with Br at center, four F atoms in a square plane and one F atom at apex)

B

Trigonal bipyramidal (with Br at center, three F atoms in a trigonal plane and two F atoms at axial positions)

C

See-saw (with Br at center, two F atoms in a plane and two F atoms at axial positions)

D

T-shaped (with Br at center, two F atoms in a plane and one F atom at axial position)

Open complete paper

4

2008 · Life Sciences · Structure and Bonding · Chemical Bonding and Molecular Structure

Life Sciences (XL) 2008

Which of the following will NOT conduct electricity?

A

Solid metallic Na

B

Solid NaCl

C

Aqueous NaCl

D

Fused NaCl

Open complete paper

5

2008 · Life Sciences · Structure and Bonding · Chemical Bonding and Molecular Structure

Life Sciences (XL) 2008

Which of the following molecules will have zero dipole moment?
\(H_2O, SiCl_4, CO_2, NH_3, BF_3\)

A

\(H_2O, SiCl_4, BF_3\)

B

\(CO_2, NH_3, SiCl_4\)

C

\(H_2O, NH_3, BF_3\)

D

\(CO_2, BF_3, SiCl_4\)

Open complete paper

6

2009 · Life Sciences · Structure and Bonding · Chemical Bonding and Molecular Structure

Life Sciences (XL) 2009

Among the following molecules the one that is planar is

A

\((CH_3)_3N \)

B

\((SO_4)^{2-} \)

C

\((CO_3)^{2-} \)

D

\(PCl_3 \)

Open complete paper

7

2010 · Life Sciences · Structure and Bonding · Chemical Bonding and Molecular Structure

Life Sciences (XL) 2010

Molecule that has no lone pair of electrons on the central atom (among the choices) is

A

XeF₄

B

PF₅

C

ClF₃

D

BF₃

Check answer

Open complete paper

8

2010 · Life Sciences · Structure and Bonding · Chemical Bonding and Molecular Structure

Life Sciences (XL) 2010

The compound that is aromatic, among the choices, is

A

[Image of benzene ring]

B

[Image of cyclopentadiene]

C

[Image of cyclopentadienyl cation]

D

[Image of cyclopentadienyl anion]

Open complete paper

9

2010 · Life Sciences · Structure and Bonding · Chemical Bonding and Molecular Structure

Life Sciences (XL) 2010

The structure of phosphorous acid is

A

HO-P(=O)(OH)-H

B

HO-P(=O)(H)-OH

C

H-P(=O)(OH)-OH

D

H-P(=O)(H)-OOH

Open complete paper

10

2011 · Life Sciences · Structure and Bonding · Chemical Bonding and Molecular Structure

Life Sciences (XL) 2011

Given that f(y) = | y | / y, and q is any non-zero real number, the value of | f(q) - f(-q) | is

A

0

B

-1

C

1

D

2

Open complete paper

11

2011 · Life Sciences · Structure and Bonding · Chemical Bonding and Molecular Structure

Life Sciences (XL) 2011

The shape of PCl5 is

A

tetrahedral

B

square planar

C

trigonal bipyramidal

D

square pyramidal

Open complete paper

12

2011 · Life Sciences · Structure and Bonding · Chemical Bonding and Molecular Structure

Life Sciences (XL) 2011

The polarity of water molecule is due to

A

its tetrahedral structure

B

bonding electrons being attracted more to oxygen

C

bonding electrons being attracted more to hydrogen

D

its weak electrolytic property

Open complete paper

13

2012 · Life Sciences · Structure and Bonding · Chemical Bonding and Molecular Structure

Life Sciences (XL) 2012

The hybridization of atomic orbitals of sulphur in SF₄ is

A

dsp²

B

sp³d²

C

sp³d

D

sp³

Open complete paper

14

2012 · Life Sciences · Structure and Bonding · Chemical Bonding and Molecular Structure

Life Sciences (XL) 2012

As predicted by MO theory, the bond order and magnetic nature of NO⁺ are

A

three and paramagnetic

B

two and diamagnetic

C

two and paramagnetic

D

three and diamagnetic

Open complete paper

15

2013 · Life Sciences · Structure and Bonding · Chemical Bonding and Molecular Structure

Life Sciences (XL) 2013

N(CH₃)₃ and N(SiH₃)₃ are congeners, but around N-atom the former has pyramidal geometry whereas the latter is nearly planar. The bonding responsible for planarity of N(SiH₃)₃ is

A

pπ–pπ

B

pπ–dπ

C

dπ–dπ

D

δ

Open complete paper

16

2013 · Life Sciences · Structure and Bonding · Chemical Bonding and Molecular Structure

Life Sciences (XL) 2013

The number of 2-center–2-electron bonds in anhydrous AlCl₃ is ____________

Check answer

Open complete paper

17

2014 · Life Sciences · Structure and Bonding · Chemical Bonding and Molecular Structure

Life Sciences (XL) 2014

Hybridizations of nitrogen in \(NO_2^+\), \(NO_3^-\), \(NH_4^+\) respectively are

A

\(sp\), \(sp^2\), and \(sp^3\)

B

\(sp\), \(sp^3\), and \(sp^2\)

C

\(sp^2\), \(sp\), and \(sp^3\)

D

\(sp^3\), \(sp^2\), and \(sp\)

Open complete paper

18

2014 · Life Sciences · Structure and Bonding · Chemical Bonding and Molecular Structure

Life Sciences (XL) 2014

Diphosphonic acid (\(H_4P_2O_5\)) has no P–P bond. This acid is

A

tetrabasic

B

tribasic

C

dibasic

D

monobasic

Open complete paper

19

2016 · Life Sciences · Structure and Bonding · Chemical Bonding and Molecular Structure

Life Sciences (XL) 2016

The species having shortest B – F bond distance is

A

BF3

B

[BF4]-

C

H3N·BF3

D

(CH3)2O·BF3

Open complete paper

20

2017 · Life Sciences · Structure and Bonding · Chemical Bonding and Molecular Structure

Life Sciences (XL) 2017

The pair of molecules having non-linear structures is

A

ICl₂⁻ and BeH₂

B

CS₂ and I₃⁻

C

SCl₂ and ClO₂⁻

D

XeF₂ and CN₂²⁻

Open complete paper