Statement I
The volume of a gas at 100 deg C and 600 mmHg will be lower at STP
Because
Statement II
Decreasing temperature and increasing pressure will cause the volume of a gas to decrease

Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1

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Both the Statement 1 and Statement 2 are correct and Statement 2 is not the correct explanation of Statement 1.

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Statement 1 is correct but Statement 2 is not correct.

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Statement 1 is not correct but Statement 2 is correct.

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Both the Statement 1 and Statement 2 are not correct.

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Solution

The correct option is A Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1
Answer(D)

Using ideal gas law $P V$ $=$ $n R T$
for given amount of a gas volume $V$ $=$ $k T / P$ ,where $k$ is a constant.
so $V$ $=$ $K * 373 / 600$ =$$0.621k$
at $S T P$ volume $V$ $=$ $k * 273 / 760$ $=$ $=$ $.35 k$
so The volume of a gas at 100 deg C and 600 mmHg will be higher than at STP,so this statement is not true
Decreasing temperature and increasing pressure will cause the volume of a gas to decrease,this is correct

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Statement IThe volume of a gas at 100 deg C and 600 mmHg will be lower at STPBecauseStatement IIDecreasing temperature and increasing pressure will cause the volume of a gas to decrease

Statement I
The volume of a gas at 100 deg C and 600 mmHg will be lower at STP
Because
Statement II
Decreasing temperature and increasing pressure will cause the volume of a gas to decrease