Comment on the following statements.
(a) Evaporation produces cooling.
(b) Rate of evaporation of an aqueous solution decreases with increases with increase in humidity .
(c) Sponge though compressible is a solid.

The rate of evaporation of a liquid ................... with increase in humidity .

Rank the following reactions A, B and C in order of increasing rate (A)

500mL of 0.2M HCN solution is diluted to 1 litre.Which of the following statement(s) is/are correct (K_(a) of HCN = 2times10^(-10)) (A) pH of solution increases. (B) pH of solution decreases. (C) Increase in degree of dissociation of HCN increases H^(+) ion concentration. (D) Decrease in concentration of solution compensates increase in degree of dissociation to decrease H^(+)

Which one of the following statements is wrong? a. Physical adsorption of gas directly related to its critical temperature. b. Chemical adsorption decreases regularly as the temperature is increased. c. Adsorption is an exothermic process. d. A solid with a smooth surface.

For capacitors charged by the same battery, does the charge stored by the capacitor increase , decrease or remain the same in each of the following situations? (a) the plate separation of a parallel plate capacitor is increased b) the radius of the inner cylinder capacitor is increased (c ) the radius of the outer spherical shell of a capacitor is increased.