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Which of the following processes described below is irreversible?
\( \mathrm{P} \)
(a) The increase in temperature of an iron rod by hammering it.
W
(b) A gas in a small container at a temperature \( T_{1} \) is brought in contact with a big reservoir at a higher temperature \( T_{2} \) which increases the temperature of the gas.
(c) An ideal gas is enclosed in a piston cylinder arrangement with adiabatic walls. A weight \( W \) is added to the piston resulting in compression of gas.
(d) All of above
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