Question

Write the chemical reaction where the following changes are observed.

1. Gas is evolved
2. Color change is noticed

3. Precipitate is formed
4. Physical state is changed​

Answer 1

Explanation:

One of the most common gas evolution reactions is an acid base reaction, where an acid is combined with a base to produce water and carbon dioxide. ... The atoms of these reactants are rearranged when they come into contact with each other and reassembled to form water, carbon dioxide, the gas product, and sodium citrate.

Answer 2

3 ans - When copper reacts with the elements (oxygen, water and carbon dioxide), it turns from its element color of reddish-brown to green. This chemical reaction is hydrated copper carbonate, and a famous example of it is the Statue of Liberty

or see above pic too

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