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. 2 NaHCO _ 3( ~s ) Na _2 CO _ 3( ~s ) + CO _ 2( ~g ) + H _2 O _ ( g ) D. Cl _ 2( ~g ) 2 Cl _ ( g ) Choose the correct answer from the options given below:
B. A, C and D
When a liquid evaporates to vapour entropy increases 2 NaHCO _ 3( ~s ) Na _2 CO _ 3( ~s ) + CO _ 2( ~g ) + H _2 O _ ( g ) Number of gaseous product molecules increases so entropy increases. Cl _ 2( ~g ) 2 Cl _ ( g ) 1 mole Cl _ 2( ~g ) form 2 ~mol Cl _ ( g ) . So entropy increases.
Related: Chemistry — Thermodynamics (C) · All PYQ Banks