Question

At constant temperature and pressure, two litres of hydrogen gas react with one litre of oxygen gas to produce two litres of water vapour. This is in accordance with ………………. 

(A) law of multiple proportion 

(B) law of definite composition 

(C) law of conservation of mass 

(D) law of gaseous volumes

Answer 1

(D) law of gaseous volumes

\(\underset{2L}{H_2(g)}+\underset{2L}{O_2(g)}\longrightarrow \underset{2L}{H_2O(g)}\)

Gay-Lussac's states that "At same temperature and pressure, when gases combine or produced in a chemical reaction, they do so in a simple ratio by volume.

Here, \(H_2\), \(O_2\) and \(H_2O(g)\) are in 2 : 1: 2 simple volume ratio.

Therefore, it follow "Law of gaseous volumes"

Answer 2

Option : (D) law of gaseous volumes