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A gas is compressed from a volume of $\;2\;m^{3}\;$ to a volume of $\;1\;m^{3}\;$ at a constant pressure of $\;100\;N/m^{2}\;$.Then it is heated at constant volume by supplying 150 J of energy . As a result , the internal energy of the gas is :

(a) Increases by 2 J\[\](b) Decreases by 250 J\[\](c) Increases by 50 J\[\](d) Decreases by 2 J

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