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 $\mathbf{N}{{\mathbf{O}}_{\mathbf{2}}}\left( \mathbf{g} \right)\text{ }\mathbf{and}\text{ }{{\mathbf{N}}_{\mathbf{2}}}{{\mathbf{O}}_{\mathbf{4}}}\left( \mathbf{g} \right)$are mixed at 400 K at partial pressures 20 bar and 2 bar respectively, more ${{\mathbf{N}}_{\mathbf{2}}}{{\mathbf{O}}_{\mathbf{4}}}$ (g) will be formed.
(iv) The entropy of the system increases.
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Ans: As, K increases with increase in temperature. K increases, it shows that the reaction must be endothermic. No. of molecules increases thus, there is increase in entropy. Hence, option(i), (iii) and (iv) are the correct answers.