Find the volume of the gas must decrease:
Answer: (3) 10%
We know that PV=nRT.
For Isothernmal system, n, R and T are constant.
Hence, PV= ConstantP α 1/V
V is inversely proportional to P.
Then, when P is increased by 10%, V get decreased by 10%.
Hence, the correct answer is option (3) 10%.