The equilibrium constant K for the reaction `2HI(g) hArr H_(2)(g)+I_(2)(g)` at room temperature is `2.85` and that at `698 K` is `1.4 xx10^(-2)`. This implies

Options

A. `HI` is exothermic compound
B. `HI` is very stable at room temperature
C. `HI` is relatively less stable than `H_(2)` and `I_(2)` at room temperature
D. `HI` is resonance stablised

Answer

C

Explanation

With increase in temperature, `K` value decreases, which means that at high temperature the reaction proceeds in backward direction or proceeds forward at room temperature. In another words, at room temperature, HI dissociates or `HI` is less stable than `H_(2)` and `I_(2)`.