In Dumas' method of estimation of nitrogen 0.35 g of an organic compound gave 55 mL of nitrogen collected at 300 K temperature and 715 mm pressure. The percentage composition of nitrogen in the compound would be (Aqueous tension at 300 K = 15 mm) 17.45

231.In Dumas' method of estimation of nitrogen 0.35 g of an organic compound gave 55 mL of nitrogen collected at 300 K temperature and 715 mm pressure. The percentage composition of nitrogen in the compound would be (Aqueous tension at 300 K = 15 mm)

(A) 14.45

(B) 15.45

(C) 16.45

(D) 17.45

Answer:: (C)

232.    In Kjeldahl's method, ammonia from 5 g of food neutralizes 30 cm3 of 0.1 N acid. The percentage of nitrogen in the food is ______.

(A) 8.4

(B) 0.84

(C) 1.68

(D) 16.8

Answer:: (B)

233.    In order to increase the volume of a gas by 10%, the pressure of the gas should be

(A) increased by 10 %

(B) increased by 1 %

(C) decreased by 10 %

(D) decreased by 1 %

Answer:: (C)

234.    In the brown ring test, the brown colour of the ring is due to

(A) ferrous nitrate

(B) ferric nitrate

(C) a mixture of NO and NO2

(D) nitrosoferrous sulphate

Answer:: (D)

235.    In the electrolytic refining of Zinc, ______.

(A) the impure metal is at the cathode.

(B) graphite is at the anode.

(C) acidified zinc sulphate.is the electrolyte.

(D) the metal ion gets reduced at the anode.

Answer:: (C)

236.    In the ionic equation - Bi  + 6H+ + Xe- ¾¾® Bi3+ + 3H2O, the values of X is

(A) 3

(B) 4

(C) 2

(D) 6

Answer:: (C)

237.    In the periodic table metals usually used as catalysts belong to

(A) s - block

(B) p - block

(C) d - block

(D) f - block

Answer:: (C)