Question #1bd0c

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SCooke
Jun 27, 2017

A few...

Explanation:

Carbonates are the most common both in abundance and the ease of# CO_2# formation.

Some metals will evolve hydrogen, usually done with more concentrated acid solutions, but it would still be viable, if not as obvious with dilute solutions.

Other compounds can release gases on reaction, such as #Na_2S# reacting with #HCl# to produce #H_2S# gas.

#Na_2SO_3 + HCl# produces #SO_2# gas along with the other products.

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