Question

By what percentage should the pressure of the given mass of gas be increased so to decrease its volume by 10% at a constant temperature?

• A. 5%
• B. 7.2%
• C. 12.5%
• D. 11.1%

Answer 1

The correct option is D 11.1%

When T is Constant , pV = Constant
When volume is decreased by $10\%$ i.e,. volume become $\frac{90}{{100}^{\prime }}$ the pressure must become $\frac{100}{90}$
Therefore $\%$ increase in pressure $=\frac{(100-90)\times 100}{90}=11.1\%$