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    				| 1. | A gas in a cylinder. Its temperature is increased by `20%` on kelvin sacle and volume is reduced to `90%` how much percentage of the gas has to leak for pressure to remain constant?A. `20%`B. `25%`C. `30%`D. `40%` | 
| Answer» Correct Answer - B `PV = n RT " "(i)` `P((90V)/(100))=n_(1)R(T+(20)/(100)T)` `or 9/10PV=6/5m+(1)RT" "(ii)` Dividing (ii) by (i),we get `6/5(n_(1))/(n)=9/10or (n_(1))/(n)=(9xx5)/(6xx10)=3/4or n_(1)=3/4n` % of gas leaked `=(n-n_(1))/(n)xx100=(1-3/4)xx100=25%` | |