For the reaction :

$2{\mathrm{SO}}_2\left(\mathrm{g}\right)+{\mathrm{O}}_2\left(\mathrm{g}\right)\rightleftarrows 2{\mathrm{SO}}_3\left(\mathrm{g}\right);\mathrm{\Delta }H=-ve$

An increase in temperature shows:

less dissociation of ${\mathrm{SO}}_3$ and an increase in $K_c$

more dissociation of ${\mathrm{SO}}_3$ and a decrease in $K_c$

 

more dissociation of ${\mathrm{SO}}_3$ and an increase in $K_c$

less dissociation of ${\mathrm{SO}}_3$ and a decrease in $K_c$