# For the reaction , the value of K is 50 at 400 K and 1700 at 500 K. Which of the following options is correct?(i) The reaction is endothermic.(ii) The reaction is exothermic.(iii) If  (g) and $N_{2}O_{4}(g)$ are mixed at 400 K at partial pressures, 20 bar and 2 bar respectively, more $N_{2}O_{4}(g)$ will be formed.(iv) The entropy of the system increases.

The answer is the option (i), (iii) and (iv)

Explanation: K increases with the increase in temperature, and when  K increases,  the reaction must be endothermic. Thus, the number of molecules increases, and there is an increase in entropy.

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