Question

1)State one example each characterised by the following along with the
chemical equation
a) change in state
b) evolution of gas​

Answer 1

Answer:

Evolution of gas:

The chemical reaction between zinc and dilute sulphuric acid is characterized by the evolution of hydrogen gas.

Zn(s)+H

2

SO4(aq)→ZnSO

4

(aq)+H

2

(g)

......................

Change in the state:

When the wax is burnt in the form of the wax candle then Water and carbon dioxide are formed. Wax is solid water is a liquid whereas carbon dioxide gas.

Explanation:

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