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1

AIPMT 2011 Mains

MCQ (Single Correct Answer)
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

AIPMT 2011 Prelims

MCQ (Single Correct Answer)
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

AIPMT 2011 Prelims

MCQ (Single Correct Answer)
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
4

AIPMT 2011 Prelims

MCQ (Single Correct Answer)
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

$$\mathop {C - H}\limits_{107\,pm} < \mathop {C = C}\limits_{134\,pm} < \mathop {C - O}\limits_{141\,pm} < \mathop {C - C}\limits_{134\,pm} $$

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