JEE Main 2021 · 24 Feb · Shift 1, Chemistry question 56

At 1990 K and 1 atm pressure, there are equal number of Cl$_2$ molecules and Cl atoms in the reaction mixture. The value of K$_P$ for the reaction $\mathrm{Cl_{2(g)}\rightleftharpoons2Cl_{(g)}}$ under the above conditions is $x\times10^{-1}$. The value of $x$ is _______. (Rounded off to the nearest integer)