Ncert Exercises & Solutions

If two elements can combine to form more than one compound, the masses of one element that combine with a fixed mass of the other element, are in whole number ratio.

1. Is this statement true?

2. If yes, according to which law?

3. Give one example related to this law.

(a) Yes, the given statement is true.

(b) According to the law of multiple proportions

(c)

\underset{2 g}{H_{2}} + \underset{16 g}{O_{2}} \to \underset{18 g}{H_{2} O}

\underset{2 g}{H_{2}} + \underset{32 g}{O_{2}} \to \underset{34 g}{H_{2} O_{2}}

Here, masses of oxygen, (i.e., 16 g in H₂O and 32 g in H₂O₂) which combine with fixed mass of hydrogen (2g) are in the simple ratio i.e., 16 : 32 or 1 : 2.