Stoichiometry - Study Mode

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[#166] A compound was found having nitrogen and oxygen in the ratio 28 gm and 80 gm respectively. The formula of the compound is

(A) N 2 O 4

(B) N 2 O 5

(C) N 2 O 3

(D) None of these

Correct Answer

(B) N 2 O 5

[#167] The molar composition of a gas is 10% H 2 , 10% O 2 , 30% CO 2 and balance H 2 O. If 50% H 2 O condenses, the final mole percent of H 2 in the gas on a dry basis will be

(A) 10%

(B) 5%

(C) 18.18%

(D) 20%

Correct Answer

(D) 20%

[#168] A gaseous mixture contains 14 kg of N 2 , 16 kg of O 2 and 17 kg of NH 3 . The mole fraction of oxygen is

(A) 0.16

(B) 0.33

(C) 0.66

(D) 0.47

Correct Answer

(B) 0.33

[#169] On addition of 1 c.c. of dilute hydrochloric acid (1% concentration) to 80 c.c. of a buffer solution of pH = 4, the pH of the solution becomes

(A) 1

(B) 8

(C) 4

(D) 2

Correct Answer

(C) 4

[#170] At room temperature, the product [H + ] [OH - ] in a solution is 10 -14 moles/litre. If, [OH - ] = 10 -6 moles/litre, then the pH of the solution will be

(A) 6

(B) 8

(C) 10

(D) 12

Correct Answer

(B) 8