Q53. When equal volume of 1 MHCl and $1 \mathrm { MH } _ { 2 } \mathrm { SO } _ { 4 }$ are separately neutralised by excess volume of 1 M NaOH solution. $x$ and $y \mathrm {~kJ}$ of heat is liberated respectively. The value of $y / x$ is $\_\_\_\_$\\