Question

Which of these reactions releases hydrogen gas?

• A. $Na+HCl\to$
• B. $N{a}_{2}C{O}_3+HCl\to$
• C. $NaHC{O}_3+HCl\to$
• D. $NaOH+HCl\to$

Answer 1

The correct option is A $Na+HCl\to$

Reactive metals react with acids to release hydrogen gas. Sodium reacts with the hydrochloric acid and gives $\text{NaCl}$ and hydrogen gas with a lot of heat and then may even result in an explosion if concentration of sodium added is large enough.

$Na+HCl\to NaCl+H_2$

Other options given are bases. Hence, no release of hydrogen gas.