#### 0.5 moles of gas A and x moles of gas B exert a pressure of 200Pa in a volume of 10 meter-cube container at 1000K. Given R is gas constant in J K^(-1) (mol) ^(-1) then x is:

Deepti Jain

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Question as appeared in JEE Main 2019. The answer given by National Testing Agency's official answer key is Option (1). Please prove.