For which of the following processes is `DeltaS` negative?

Options

A. C (diamong) `to` C(grpahite)
B. `N_(2)`(g, 1 at ) `toN_(2)` (g,5atm)
C. `N_(2)` (g,273K)`toN_(2)` (g,300K)
D. `H_(2)(g)to2H(g)`

Answer

B

Explanation

(a) When diamond is converted into graphite when it is heated to `1500^(@)C` and entropy is increased of `DeltaSgt0`
(b) When pressure increases then molecules of gas will come closer and intermolecular distance decreases so entropy will also decrease and `DeltaSlt0`
(c) When we increase the temperature of a gas then randomness is increased due to kinetic energy gained by molecules. So `DeltaSgt0`
d. `H_(2)` molecule is converted into atoms, the no. of particles increases. Thus entropy will increase. So `DeltaSgt0`