1
MCQ (Single Correct Answer)

AIPMT 2001

In X - H --- Y, X and Y both are electronegative elements. Then
A
electron density on X will increase and on H will decrease
B
in both electron density will increase
C
in both electron density will decrease
D
on X electron density will decrease and on H increases.

Explanation

As X and Y both are electronegative elements thus both attracts the electron density from H thus, electron density on H decreases and on X it increases.
2
MCQ (Single Correct Answer)

AIPMT 2001

In which of the following bond angle is maximum ?
A
NH3
B
NH4+
C
PCl3
D
SCl2

Explanation

Bond angle is maximum in NH4+ tetrahedral molecule with bond angle 109°.
3
MCQ (Single Correct Answer)

AIPMT 2001

Nitrogen forms N2, but phosphorus does not form P2, however, it converts P4, reason is
A
triple bond present between phosphorus atom
B
p$$\pi $$ $$-$$ p$$\pi $$ bonding is weak
C
p$$\pi $$ $$-$$ p$$\pi $$ bonding is strong
D
multiple bonds form easily.

Explanation

For strong $$\pi $$-bonding, p$$\pi $$ - p$$\pi $$ bonding should be strong. In case of P, due to larger size as compared to N-atom, p$$\pi $$ - p$$\pi $$ bonding is not so strong.
4
MCQ (Single Correct Answer)

AIPMT 2001

Which of the following two are isostructural?
A
XeF2, IF2$$-$$
B
NH3, BF3
C
CO32$$-$$, SO32$$-$$
D
PCl5, ICl5

Explanation

Compounds with same shape and same hybridisation are known as isostructural.

XeF2, IF2- $$ \to $$ both are sp3 hybridised linear molecules.

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