In which of the following process, a maximum increase in entropy is observed?

238.    In which of the following process, a maximum increase in entropy is observed?

(A) dissolution of salt in water

(B) condensation of water

(C) sublimation of naphthalene

(D) melting of ice

Answer:: (C)

239.    In which of the following, NH3 is not used?

(A) Group reagent for the analysis of IV group basic radical.

(B) Group reagent for the analysis of IIIgroup basic radical.

(C) T0llen's reagent

(D) Nessler's reagent

Answer:: (D)

240.    In which one of the following, does the given amount of chlorine exert the least pressure in a vessel of capacity 1 dm3 at 273K?

(A) 0.071 g

(B) 0.0355 g

(C) 0.02 mole

(D) 6.023 x 1021 molecules

Answer:: (B)

241.    Which one of the following statements is true'?

(A) Drying of oil involves hydrolysis

(B) Saponification of oil yields a diol.

(C) Refining of oil involves hydrogenation

(D) Addition of antioxidant to oil minimizes rancidity

Answer:: (D)

242.    IUPAC name of (CH3)3CCl

(A) 2 chloro 2 methyl propane

(B) t-butyl chloride

(C) n-butyl chloride

(D) 3-chloro butane

Answer:: (A)

243.    Which one of the following statements is not true regarding (+) Lactose?

(A) (+) Lactose, C12H22O11 contains 8-OH groups

(B) On hydrolysis (+) Lactose gives equal amount of D(+) glucose and D(+) galactose

(C) (+) Lactose is a b-glycoside formed by the union of a molecule of D(+) glucose and a molecule of D(+)

galactose

(D) (+) Lactose is reducing sugar and does not exhibit mutarotation

Answer:: (D)