Q37. At $- 20 ^ { \circ } \mathrm { C }$ and 1 atm pressure, a cylinder is filled with equal number of $\mathrm { H } _ { 2 } , \mathrm { I } _ { 2 }$ and HI molecules for the reaction $\mathrm { H } _ { 2 } ( \mathrm {~g} ) + \mathrm { I } _ { 2 } ( \mathrm {~g} ) \rightleftharpoons 2 \mathrm { HI } ( \mathrm { g } )$, the $\mathrm { K } _ { \mathrm { p } }$ for the process is $x \times 10 ^ { - 1 } \cdot \mathrm { x } =$ [Given : $\mathrm { R } = 0.082 \mathrm {~L} \mathrm {~atm} \mathrm {~K} ^ { - 1 } \mathrm {~mol} ^ { - 1 }$ ]\\
(1) 0.01\\
(2) 10\\
(3) 2\\
(4) 1