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21.

For the reaction $H_{2}(g) + \frac{1}{2}O_{2}(g)\rightarrow H_{2}O(l)$.ΔH = - 285.8 kJ/mol, ΔS = - 0.163kJ/molK.What is the value of free energy change at 27°C for the reaction?

A) -236.9kJ/mol

B) -281.4kJ/mol

C) -334.7kJ/mol

D) +334.7kJ/mol

22.

Copper sulfate solution reacts with KCN to give

A) $Cu(CN)_{2}$

B) CuCN

C) $K_{2}[Cu(CN)_{4}]$

D) $K_{3}[Cu(CN)_{4}]$

23.

In a closed insulated container a liquid is stirred with a paddle to increase its temperature. In this process which of the following is true?

A) $\triangle E = W = Q = 0$

B) $\triangle E \neq 0, Q = W = 0$

C) $\triangle E = W \neq 0, Q= 0$

D) $\triangle E = Q \neq 0, W = 0$

24.

What is X in the following change?

A) $CH_{3}OH,H_{2}SO_{4}$

B) $CH_{3}OH,CH_{3}\overline{O}N^{+}a$

C) $H_{2}O/H_{2}SO_{4}$ followed by $CH_{3}OH$

D) $CH_{3}MgBr/H_{3}O^{+}$

25.

Ethylene glycol, on oxidation with periodic acid, gives

A) Oxalic acid

B) Glycol

C) Formaldehyde

D) Glycolic acid

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