Question

Q17. Write chemical equation of the reaction in which the following char
an example of each:
3:
A)Change in colour. B)Change in temperature. C)Formation of precipitate​

Answer 1

Answer:

Explanation:

2AgBr > 2Ag +Br^2

Caco3> CAO+Co2

Na2So4+ BaCl2> BaSo4 +2NaCl

Answer 2

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.