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0.5 moles of gas A and x moles of gas B exert a pressure of 200 Pa in a container of volume 10 m 3 at 1000 K. Given R is the gas constant in JK –1 mol –1 , x is -

1. R 4 R 2 −
2. R 2 R 4 +
3. R 2 R 4 −
4. R 4 R 2 +

Correct answer: R 2 R 4 −

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