CBSE Class 12-science Answered

Volume Strength:

It means,

1 ml of 10 vol. gives 10 ml of oxygen.

1 ml of 15 vol. gives 15 ml of oxygen.

1 ml of 20 vol. gives 20 ml of oxygen.

Replace ml by Litre:

1 L of 10 vol. gives 10 L of oxygen.

1 L of 15 vol. gives 15 L of oxygen.

1 L of 20 vol. gives 20 L of oxygen.

We are taking half litres of each sample,

5 L + 7.5 L + 10 L = 22.5 L

Now equal volume of water is added and it is diluted.

i.e. 22.5 L of water is added.

So, 22.5 L + 22.5 L = 45 L

So total volume of solution = 45 L

Out of 45 L, the amount of oxygen which will be released is 22.5 L

So volume strength of final solution will be = 22.5/45 = 0.5 L or 0.5 vol.