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NEET Chemistry Solved Question Paper 2001

Multiple Choice Questions

Hybridisation in ${CH}_{3}, \overset{+}{C} H_{3} and \bar{C} H_{3}$ are respectively

sp², sp², sp³
sp², sp³, sp³
sp³, sp³, sp²
sp³, sp², sp³

Which of the following arrangements is possible?

n l m s

5 2 2 $+ \frac{1}{2}$
n l m s

2 2 0 $- \frac{1}{2}$
n l m s

3 -2 1 $+ \frac{1}{2}$
n l m s

0 0 1 $+ \frac{1}{2}$

Which of the following is strongest Bronsted base?

ClO-
ClO₂^-
ClO₃^-
ClO₄^-

In which of the following $pπ - dπ$ bonding is possible?

${CO}_{3}^{2 -}$
${PO}_{4}^{3 -}$
${NO}_{3}^{-}$
${NO}_{2}^{-}$

Which of the following is always feasible?

$∆ H = T ∆ S$
$∆ H (+ ve), T ∆ S (- ve) and ∆ H > T ∆ S$
$∆ H (- ve), T ∆ S (+ ve) and ∆ H < T ∆ S$
$∆ H (- ve), T ∆ S (- ve) and ∆ H > T ∆ S .$

6.
Given that
$C + O_{2} \to {CO}_{2}; ∆ H^{°} = - a kJ . 2 CO + O_{2} \to 2 {CO}_{2}; ∆ H^{°} = - b kJ .$
The heat of formation of CO is

$b - 2 a$

$\frac{2 a - b}{2}$

$\frac{b - 2 a}{2}$

2a-b

$\frac{b - 2 a}{2}$

$C + O_{2} \to {CO}_{2}; ∆ H^{°} = - a kJ 2 CO + O_{2} \to 2 {CO}_{2}; ∆ H^{°} = - b kJ Formation of CO can be written as : C + \frac{1}{2} O_{2} \to CO; ∆ H^{°} = ? Adding equation : C + O_{2} \to {CO}_{2}; ∆ H^{°} = - a kJ {CO}_{2} \to {CO}_{2} + \frac{1}{2} O_{2}; ∆ H^{°} = \frac{b}{2} kJ We get ∆ H_{f}^{°} (CO) = \frac{b}{2} - a = \frac{b - 2 a}{2}$