Question

What is the ratio of hydrogen to oxygen by volume after decomposing the water by an electric current?

• A. $1:8$
• B. $1:2$
• C. $1:9$
• D. $2:1$

Answer 1

The correct option is D $2:1$

The ratio of hydrogen to oxygen by volume after decomposing the water by an electric current is $2:1$
$2H_{2}O\to 2H_2+O_2$
Thus, the decomposition of 2 moles of water gives 2 moles of hydrogen and one mole of oxygen.
The ratio of hydrogen to oxygen by number of moles is $2:1$
Volume is directly proportional to the number of moles.
Hence, the ratio of hydrogen to oxygen by volume after decomposing the water by an electric current is $2:1$