1
MCQ (Single Correct Answer)

AIPMT 2011 Mains

Which of the following structures is the most preferred and hence of lowest energy for SO3?
A
B
C
D

Explanation

has maximum number of covalent bonds.
2
MCQ (Single Correct Answer)

AIPMT 2011 Prelims

The pairs of species of oxygen and their magnetic behavior are noted below. Which of the following presents the correct description?
A
O$$_2^ - $$, O$$_2^{2 - }$$ - Both diamagnetic
B
O+, O$$_2^{2 - }$$ - Both paramagnetic
C
O$$_2^{ + }$$, O2 - Both paramagnetic
D
O, O$$_2^{2 - }$$ - Both paramagnetic

Explanation

$$O_2^+$$ and $$O_2$$ are paramagnetic in nature as they contain one and two unpaired electrons respectively.
3
MCQ (Single Correct Answer)

AIPMT 2011 Prelims

The correct order of increasing bond length of C $$-$$ H, C $$-$$ O, C $$-$$ C and C$$=$$C is
A
C $$-$$ H < C$$=$$C < C $$-$$ O < C $$-$$ C
B
C $$-$$ C < C$$=$$C < C $$-$$ O < C $$-$$ H
C
C $$-$$ O < C $$-$$ H < C $$-$$ C < C$$=$$C
D
C $$-$$ H < C $$-$$ O < C $$-$$ C < C$$=$$C

Explanation

Increasing order of bond length is

$$\mathop {C - H}\limits_{107\,pm} < \mathop {C = C}\limits_{134\,pm} < \mathop {C - O}\limits_{141\,pm} < \mathop {C - C}\limits_{134\,pm} $$
4
MCQ (Single Correct Answer)

AIPMT 2011 Prelims

Which of the two ions from the list given below that have the geometry that is explained by the same hybridization of orbitals, NO$$_2^ - $$. NO$$_3^ - $$, NH$$_2^ - $$, NH$$_4^ + $$, SCN$$-$$?
A
NO$$_2^ - $$ and NO$$_3^ - $$
B
NH$$_4^ + $$ and NO$$_3^ - $$
C
SCN$$-$$ and NH$$_2^ - $$
D
NO$$_2^ - $$ and NH$$_2^ - $$

Explanation

Ions Hybridisation
$$NO_2^-$$ $$sp^2$$
$$NO_3^-$$ $$sp^2$$
$$NH_2^-$$ $$sp^3$$
$$NH_4^+$$ $$sp^3$$
$$SCN^-$$ sp

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