Question

Give on example of each:
@ Chemical reaction Showing evolution of gas
(b) Change in Substance's Colour during Chemical
reaction-​

Answer 1

Answer:

a)Zn+HCl gives ZnCl+H2

H2 is evolve

b)CuSO4+Fe gives FeSO4+Cu

CuSO4 is blue and FeSO4 is green

this is answer

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Answer 2

Answer:

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.In a chemical reaction, the gas is evolved as product. Most of the gas evolution reactions can be carried out in fume chamber. some chemical reactions are characterized by change in color. Citric acid reacts with potassium permanganate, then the purple colour disappears.

Explanation:

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