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Question

Which of these reactions releases hydrogen gas?

A
Na + HCl
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B
Na2CO3 + HCl
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C
NaHCO3 + HCl
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D
NaOH + HCl
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Solution

The correct option is A Na + HCl
Reactive metals react with acids to release hydrogen gas. Sodium reacts with the hydrochloric acid and gives 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+HClNaCl+H2

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

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