The reaction, `2NOCl(g)hArr2NO(g)+Cl_2(g),/_\H>0` is in equilibrium. Which of the following changes at equilibrium will decrease the yield of NO(g)-

Options

A. at constant temperature and volume, some amount of NOCl(g) is added to the reaction system
B. at constant temperature and volume, some amount of `Cl_2(g)` is added to the reaction system
C. temperature is decreased at equilibrium
D. at constant temperature and pressure some amount of He gas is added to the reaction system

Answer

B, C