Question

example of chemical equation where gas is formed​

Answer 1

Answer:

CH4(g) + 2O2(g) → CO2(g) + 2H2O(l)

CaCO3(s) + 2 HCl(aq) → CaCl2(aq) + CO2(g) + H2O (l)

C4H6O6(aq) + NaHCO3(aq) → NaC4H5O6(aq) + H2O (l) + CO2(g)

Explanation:

Answer 2

Answer:

Any active or moderate metal when made to react with a dilute or concentrated acid produces a salt and evolves hydrogen gas in the reaction.

For example

Zinc granules when made to react with dil.HCl gives ZnCl2 and H2 gas.

Also, when an acetate salt is made to react with a dilute acid it evolves carbondioxide gas which appears to us as effervescence.

Also, when carbonates react with acids they produce hydrogen carbonate, carbondioxide and water as products.

Hope this helps you !