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JEE Chemistry Solved Question Paper 2013

Multiple Choice Questions

11.

Identify a species which is not a Bronsted acid but a Lewis acid

BF₃
H $_{3}^{+}$ O
NH₃
HCl

12.

d²sp³ hybridisation of the atomic orbitals gives

square planar structure
triangular structure
tetrahedral structure
octahedral structure

13.

The pH of 10^-8 M HCl solution is

8
6.9586
more than 8
slightly more than 7

14.

A group of atoms can function as a ligand only when

It is a small molecule
It has an unshared electron pair
Its a negatively charged ion
It is a positively charge ion

15.

Which of the following is diamagnetic?

H $_{2}^{+}$
He $_{2}^{+}$
O₂
N₂

16.

The number of anti-boinding electron present in O $_{2}^{+}$ molecular ion is

17.

The process is spontaneous at the given temperature, if

ΔH is +ve and ΔS is -ve
ΔH is -ve and ΔS is +ve
ΔH is +ve and ΔS is +ve
ΔH is +ve and ΔS is equal to zero.

18.
Mesomeric effect involves

delocalisation of π- electron

delocalisation of σ- electron

partial displacement of electrons

delocalisation of π and σ- electron

delocalisation of π- electron

Resonance or mesomeric effect is defined as, the polarity produced in the molecule by the interaction of two π-bonds or between a π-bond and a lone pair of electrons present on an adjacent atom There are two types of mesomeric effect.+M effect is observed when direction of electron displacement is away from an atom or substituent group attached to the conjugated system eg, - halogen, -OH, —NH₂, etc On the other hand,–M effect is observed when the transfer of electrons Is towards the atom or substituent group attached to the conjugted systems, eg, —NO₂_,—COOH etc.