Physical Chemistry MCQ with Answers

Physical Chemistry MCQ with Answers

126) Hydrochloric acid solution A and B have concentrations of 0.5N ans 0.1N respectively. The volumes of solutions A and B required to make 2 L of 0.2N HCl are:

Answer is:

0.51 L of A + 0.51 L of B

127) 10.6 gm of a substance of molecular weight 106 was dissolved in 100 mL. 10 mL of this solution was pipetted out into a 1000 mL flask and made upto the mark with distilled water. The molarity of the resulting solution is:

Answer is:

0.01M

128) NaClO solution reacts with H₂SO₃ as NaClO + H₂SO₃ → NaCl + H₂SO₄. A solution of NaClO used in this reaction contained 15 gm of NaClO per litre. The normality of the solution would be:

Answer is:

0.33

Explanation:

N = (w x 1000) ⁄ (Eq. wt. x V(mL))

129) The vapour pressures of pure benzene and toluene are 160 and 60 torr respectively. The mole fraction of toluene in vapour pressure in contant with equimolar solution of benzene and toluene is:

Answer is:

0.27

130) Van′t Hoff factor for a dilute solution of sodium argento cyanide is:

Answer is:

2

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