-p-Block elements - I — Chemistry STD 11 Science — Question

$N _{2} O _{4}( g ) \rightleftharpoons 2 NO _{2}( g ) ; \Delta H ^{0}=+58 kJ$

For each of the following cases $(a, b),$ the direction in which the equilibrium shifts is:

$(a)$ Temperature is decreased

$(b)$ Pressure is increased by adding $N _{2}$ at constant $T$

$X + \frac{1}{2}{O_2}\,\, \to \,\,XO + 90.8\,kJ$

It follows that the heat of reaction for the following process $M + XO$ $\rightleftharpoons$ $MO + X$ is given by......$kJ$