1

### AIPMT 2015 Cancelled Paper

Which of the following statements is correct for a reversible process in a state of equilibrium?
A
$\Delta$Go = $-$2.30 RT log K
B
$\Delta$Go = 2.30 RT log K
C
$\Delta$G = $-$2.30 RT log K
D
$\Delta$G = 2.30 RT log K

## Explanation

$\Delta$G = $\Delta$Go + 2.303 RT log Q

At equilibrium, when $\Delta$G = 0 and Q = K

then 0 = $\Delta$Go + 2.303 RT log K

$\Delta$Go = – 2.303 RT log K
2

### AIPMT 2015

Which one of the following pairs of solution is not an acidic buffer ?
A
CH3COOH and CH3COONa
B
H2CO3 and Na2CO3
C
H3PO4 and Na3PO4
D
HClO4 and NaClO4

## Explanation

An acidic buffer is a mixture of a weak acid and its salt with a strong base. Among CH3COOH, H2CO3, H3PO4 and HClO4, the HClO4 is a strong acid while all other are weak acid thus, HClO4 and NaClO4 does not constitute to form an acidic buffer.
3

### AIPMT 2015

Aqueous solution of which of the following compounds is the best conductor of electric current ?
A
Hydrochloric acid, HCl
B
Ammonia, NH3
C
Fructose, C6H12O6
D
Acetic acid, C2H4O2

## Explanation

HCl completely dissociates to give H+ and Cl- ions, hence act as very good electrolyte. While others are non- electrolytes.
4

### AIPMT 2015

If the equilibrium constant for

N2(g) + O2(g) $\rightleftharpoons$ 2NO(g) is K, the equilibrium

constant for

${1 \over 2}$ N2(g) + ${1 \over 2}$O2(g) $\rightleftharpoons$ NO(g) will be
A
${1 \over 2}$ K
B
K
C
K2
D
K1/2

## Explanation

When a reaction is divided by factor n then the new equilibrium constant of the reaction will be $\root n \of K$ .

Thus, here the given reaction is multiplied by factor ${1 \over 2}$ then the new equilibrium constant will be ${K^{{1 \over 2}}}$ .

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