Question

When HNO3 is slowly dropped on to a piece of CaCO3, bubbles appear on the surface of the solid. Which of the following explains this observation?NH3 gas is formed in the reaction.Both CO2 and H2 gases are formed in the reaction.H2 gas is formed in the reaction.CO2 gas is formed in the reaction.

Answer 1

Answer: In the above reaction,
`CO_2` gas is formed in the reaction.

Step-by-step explanation:

We are given:

Nitric acid
`(HNO_3)` is dropped in calcium carbonate
`(CaCO_3)`, a gas is released.

The chemical equation for the reaction of nitric acid and calcium carbonate follows:

`CaCO_3(s)+2HNO_3(aq.)\rightarrow CO_2(g)+Ca(NO_3)_2(aq.)+H_2O(l)`

By Stoichiometry of the reaction:

1 mole of calcium carbonate reacts with 2 moles of nitric acid to produce 1 mole of carbon dioxide, 1 mole of calcium nitrate and 1 mole of water molecule.

Carbon dioxide gets released in the form of effervescence (bubbles).

Hence, in the above reaction,
`CO_2` gas is formed in the reaction.