Chemistry, asked by ggg123mailcom, 1 year ago

Give one example each of a chemical reaction characterised by: evolution of gas, change in colour, formation of a precipitate, change in temperature and change in state
(class 10 CBSE SAMPLE PAPER 2017-18 SCIENCE)give one example of chemical reaction

Answers

Answered by komal271
0
what I did nt understood
Answered by BendingReality
0

Answer:

1. Change in colour :

The reaction between lead nitrate solution and poassium iodide solution.

Chemical equation as follow :

Pb ( NO₃ )₂ + 2 KI  ⇒  PbI₂ + 2 KNO₃

In above reaction colour change from colourless to yellow.

2. Change in temperature :

The reaction between dil. sulphuric acid on zinc.

Chemically :

Zn + H₂SO₄  ⇒  ZnSO₄ + H₂

Heat evolved in the above reaction.

3. Formation of precipitation​ :

The reaction between barium chloride on sodium sulphate.

Chemically :

BaCl₂ + Na₂SO₄  ⇒  BaSO₄ + 2 NaCl

In the above reaction white ppt. of BaSO₄ will form.

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