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Which of the processes described below a...

Which of the processes described below are irreversible ?

A

The increase in temperature of an iron rod by hammering it.

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

A quasi-static isothermal expansion of an ideal gas in cylinder fitted with a frictionless piston.

D

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.

Text Solution

Verified by Experts

The correct Answer is:
A, B, D
(A) During hammering the rod external work is done on the rod in hammering and raises the temperature, so process is not reversible.
B) The heat of bigger container transfer to smaller container at temperature `T_2` to `T_1` the process cannot be retraced itself.
(C) A quasi-static isothermal expension of an ideal gas in cylinder fitted with a frictionless pistion.
(D) As the weight is added to the cylinder arrangement in the form of external pressure hence, it cannot be reversed back itself.
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Knowledge Check

  • Which of the processes is used in thermite welding?

    A
    `TiO_2 + 4Na to Ti + 2Na_2O`
    B
    `2Al + Fe_(2)O_3 to Al_2O_3 + 2Fe`
    C
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    D
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  • Which of the following processes does not involve oxidation of iron?

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    Rusting of iron sheets
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    D
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