Question

Products are favoured in a chemical reaction taking place at a constant temperature and pressure. Consider the following statements :
(i) The change in Gibbs energy for the reaction is negative.
(ii) The total change in Gibbs energy for the reaction and the surroundings is negative.
(iii) The change in entropy for the reaction is positive.
(iv) The total change in entropy for the reaction and the surroundings is positive.
The statements which are ALWAYS true are :-

• A. only (i) and (iii)
• B. only (i) and (iv)
• C. only (ii) and (iv)
• D. only (ii) and (iii)

Answer 1

Answer: (B)

Since products are formed in the chemical reaction taking place at constant temperature and pressure, we can say that the reaction is spontaneous.
Hence, $\Delta G_{\text{reaction }}<0$
$\Delta S_{\text{total }}>0$