Every question from past board papers on Second law, entropy and spontaneity, newest paper first. Open any question for its full worked answer.
In which of the following processes entropy increases?
A. A liquid evaporates to vapour.
B. Temperature of a crystalline solid lowered from 130 K to 0 K.
C. \(2NaHCO_{3(s)} \rightarrow Na_2CO_{3(s)} + CO_{2(g)} + H_2O_{(g)}\)
D. \(Cl_{2(g)} \rightarrow 2Cl_{(g)}\)
Choose the correct answer from the options given below:
For irreversible expansion of an ideal gas under isothermal condition, the correct option is :
For the reaction, 2Cl(g) \(\rightarrow\) Cl\(_2\)(g), the correct option is :
In which case change in entropy is negative ?
The correct thermodynamic conditions for the spontaneous reaction at all temperatures is :
For a sample of perfect gas when its pressure is changed isothermally from \(p_i\) to \(p_f\), the entropy change is given by
