Ans : A (38%)

1. 
   

   By pV=nRT gives p = (nR/V)T which is a straight line for p (Pa) and T (K).

   
   


2. 
   

   However, T = 273 + θ

   
   


3. 
   

   Therefore, pV = nR(θ+273).
   p is a straight line with slope = nR/V
   and y-intercept 273nR / V

   
   


4. 
   

   Now, the number of gas molecules in the vessel is halved. Therefore, both the slope and y-intercept will decrease.