When diamond is converted into graphite (it is heated to 1500∘C ) entropy is increased, ∆S>0 (b) When pressure increases then molecules of gas will come closer and intermolecular distance decreases, so cntropy will also decrease, ∆S<0 (c) When we increase the temperature of a gas then randomness is increased as the kinetic energy gained by molecules. So, ∆S>0 (d) H2 molecule is converted into atoms, the no. of particles increases. Thus entropy will increase, ∆S>0