Question

4. Metals react with acids to produce ______ gas. ​

Answer 1

Answer:

Metals react with acids to produce hydrogen gas.

Metals react with acids and displaces hydrogen from the acids to produce hydrogen gas and metal salt.

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Answer 2

here is your answer

And is "hydrogen"

Explanation:When hydrogen with metal, a salt and hydrogen are produced :

Acid+Metal-----salt +hydrogen

An ex-Nitric acid + Calcium -----calcium nitrate +hydrogen

The salt that is produced depends upon which acid and which metal is react....

I hope that you understood.. Why does it happened....