+91-8076753736[email protected]
logo
logo
-->

Chemical Kinetics

Question
CBSEENCH12010996
Wired Faculty App

An aqueous solution contains 0.10 M H2S and 0.20 M HCl. If the equilibrium constants for the formation of HS– from H2S is 1.0 x10–7 and that of S2- from HS– ions is 1.2 x 10–13 then the concentration of S2- ions in aqueous solution is

  • 5 x 10-19

  • 5 x 10-8

  • 3 x 10–20

  • 6 x 10-21

Solution

C.

3 x 10–20

H2S (aq.)(0.1 -x)≅ 0.1 ⇋ 2H+(2x +0.20)≅ 0.2 +  S2-X,Ka = Ka1 x Ka2 = 1.2 x 10-201.2 x 10-20 = (0.2)2 x [S2-]0.1[S-2] = 3 x 10-20

Some More Questions From Chemical Kinetics Chapter

What will be the effect of temperature on rate constant?

A reaction is 50% complete in 2 hours and 75% complete in 4 hours. What is the order of the reaction.

The rate law for the decomposition of N2O5 is rate = k[N2O5]. What is the significance of k in this equation?

Define activation energy of a reaction.

Mock Test Series

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation