Question

AN EXAMPLE OF CHEMICAL CHANGE IN WHICH GAS IS EVOLVED
ANSWER ACCORDING TO 7TH GRADE

Answer 1

Answer:

Evolution of Gas – Some chemical reactions take place with the evolution of gas. For example, when zinc reacts with hydrochloric acid, hydrogen gas is evolved with formation of zinc chloride. ... For example, barium chloride reacts with sodium sulphate and forms sodium chloride and precipitate of barium sulfate.

Explanation:

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Answer 2

Answer:

Zn+H2SO4-----ZnSO4+H2