Q. Pick out the correct statement.

• (A) Higher hold up of the solid in the rotary dryer results in better exposure of the solids to the gas
• (B) The 'Hatta number' is important in problems involving gas absorption without chemical reaction
• (C) For a non-reacting binary mixture of ideal gases, the partial pressure distribution of both components is linear in the case of steady state equimolal counter-diffusion
• (D) Total reflux in case of distillation operation requires infinite number of plates for a binary system separation