Question

explain with suitable example of equation in which physical state and gases related​

Answer 1

Explanation:

1.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)

2.Change in colour:

The reaction between the lead nitrate solution and potassium iodide solution.

Pb(NO 3 ) 2 (aq)+2KI→PbI 2 (s)+2KNO 3 (aq)

In this reaction colour changes from colourless to yellow.

3.Formation of precipitate:

The action of Barium Chloride on sodium sulphate.

BaCl 2 (aq)+Na 2 SO 4 (aq)→BaSO 4 (s)+2KNaCl(aq)

4.Change in temperature:

The action of dilute sulphuric acid on zinc:

Zn(s)+H 2 SO 4 (aq)→ZnSO 4 (s)+H 2 (g)

In this reaction, heat is evolved.

5.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 is a gas.

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