Science, asked by sabirgulam170, 7 months ago


3. Give one example each of a chemical reaction showing the following characteristics
1 a, evolution of a gas
b. change of colour
e. formation of precipitate
d, change of state from liquid to gas
e. change of state from gas to liquid
dothermic reactions and exothermic reactions .​

Answers

Answered by tanushri6a34
0

Answer:

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 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 gas.

Answered by sabnamprveen485
0

Explanation:

your 3d answer how can it's possible...

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