Question

100 cm³ of a given sample of H₂O₂ gives 1000 cm³ of O₂ at S.T.P. The given sample is

(a) 10% H₂O₂

(b) 90% H₂O₂

(c) 10 volume H₂O₂

(d) 100 volume H₂O₂

Answer 1

Option (c) is correct

Explanation :

The decomposition reaction of H₂O₂

H₂O₂-> H₂O +1/2O₂

So 1/2 mole or 11.2L O₂ at STP is obtained from 1mole or 34g H₂O₂

Hence 1000cc or 1L O₂ at STP will be obtained from (34/11.2)g H₂O₂

So H₂O₂ is 3.03%.Given percent strength does not match.

Again 100cc of the sample produces 1000cc O₂ at STP  or 10 times the volume of the sample. Hence strength of the sample is 10 volume

Answer 2

Correct option (c) 10 volume H₂O₂    

Explanation:

or 1 mL of H₂O₂ will give 10 mL of O₂ at STP Thus, its volume strength is 10 volume.