Question

write the chemical equation of the reaction in which the changes have taken place with an example of each

1 Indian colour
2 change in temperature
3 formation of precipitation​

Answer 1

Answer:

change in colour:- Pb(No3)2(aq)+2kl--PbI2(s)+2KnO3

change in temperature

Zn(s)+H2SO4(aq)-- ZnSO4(aq)+H2

formation and precipitate:-

BaCl2+Na2So4--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.