Question

Hydrogen and oxygen combine in the ratio of ________ to form water.

• A. 1:2
• B. 8:1
• C. 2:1
• D. 1:8

Answer 1

The correct option is C

2:1

The explanation for the correct option- (C) 2:1

Compound - It is a pure substance made by a chemical reaction of two or more different elements in a fixed proportion.

For example – Water, sugar, and table salt.

The following reaction shows the ratio of hydrogen and oxygen required to form water

$$\begin{gathered} 2{\mathrm{H}}_2\left(\mathrm{g}\right)+{\mathrm{O}}_2\left(\mathrm{g}\right)\to 2{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right) \\ \left(\mathrm{hydrogen}\right)\left(\mathrm{oxygen}\right)\left(\mathrm{water}\right) \end{gathered}$$

from the above reaction, it is clear that 2 molecules of hydrogen and 1 molecule of oxygen are required to form water.

Hence, option (C) is correct. Hydrogen and oxygen combine in a ratio of 2:1 to form water.