The temperature at which magnitude of Kpunits=atm∆n and Kcunits=mole/lit∆n are always equal for every gaseous reaction is

For a gaseous reaction, ∆n may be or may not be zero ;We know,Kp=KcRT∆n; Kp  is always equal to Kc  only when RT∆n=1 ; ∵∆n is a variable, RT must be one so that 1∆n is always one; If RT=1 ; T=10.0821=12.18 K ;