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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