[amp_mcq option1=”oxygen” option2=”nitrogen” option3=”chlorine” option4=”hydrogen” correct=”option4″]
The correct answer is D. Hydrogen.
When a metal reacts with water, the metal atoms displace the hydrogen atoms in the water molecules. This produces hydrogen gas and a metal hydroxide. The reaction is as follows:
$2 \text{Na} + 2 \text{H}_2\text{O} \to 2 \text{NaOH} + \text{H}_2$
Oxygen is not produced in this reaction. Nitrogen and chlorine are not elements that are typically found in water.