Some dead plaster is taken in a closed and evacuated glass bulb and heated at 1500 K when the following equilibrium is obtained:
 ${\text{2CaSO}}_{\text{4}}\text{(s})\rightleftharpoons 2\text{CaO(s)}+2{\text{SO}}_{\text{2}}\text{(g)}+{\text{O}}_{\text{2}}\text{(g})\Delta {\rm H}>\text{0}$
Identify the correction option(s)
 

moles of  $\text{CaO(s)}$ will increase with increase in temperature

if volume of glass bulb is suddenly doubled, partial pressure of  ${\text{SO}}_{\text{2}}\text{(g)}$   will be instantly and momentarily halved
 

if the volume of glass bulb is very slowly halved, partial pressure of  ${\text{O}}_{\text{2}}\text{(g)}$ will remain constant throughout 
 

if helium gas is added to the bulb at constant pressure, more  $\text{CaO(s)}$ will be produced