Question

The volume of 10 volume H2O2 solution that decolourises 200 ml of 2N KMnO4 solution in acidic medium is

(a) 112 ml (b) 336ml (c)200ml (d)224 ml

Answer 1

The volume of 10 volume H2O2 solution that decolourises 200 ml of 2N KMnO4 solution in acidic medium is

(a) 112 ml
(b) 336ml

(c)200ml✔️✔️

(d)224 ml

Answer 2

Answer:

D

Explanation:

10 volume H2O2 means 1L of H2O2 will librate 10L of O2 at STP.

since 1 mole oxygen gas is librated by 2 moles of H2O2.

22.4L of oxygen gas is librated by 2 moles of H2O2.

10L of oxygen gas is librated by (2/22.4)10=0.8928moles H2O2.

moles of H2O2 = (0.8928)34=30.357g.

N=(weight)1L/equivalent weight =(30.357)1/17=1.78g/L.

N1V1=N2V2

1.78V1=(2)200

V1= 224ml