For an isothermal process, I. pressure of a given mass of a gas varies inversely as its volume. ...

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For an isothermal process,
I. pressure of a given mass of a gas varies inversely as its volume.
II. during expansion of gas, work is done by the gas on environment.
III. during compression heat is released.
Choose the correct statement.
(a) Only II
(b) Both I and II
(c) Both I and III
(d) I, II and III
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