Question

Write the chemical equation of the reaction with an example in which the following changes
has taken place:
(a) Change in colour
(b) Change in temperature
(c) Formation of precipitate

please send quick answer​

Answer 1

Answer:

Explanation:

( a ) Change in Colour

Fe ( OH )₃ + Al ⇒ Al ( OH )₃ + Fe

In this colour changes from Green to Colourless

( b ) Change in Temperature

Zn ( s ) + H₂SO₄ ( aq ) ⇒ ZnSO₄ ( aq ) + H₂ ( g )

It is an exothermic reaction

( c ) Formation of precipitate

AgNO₃ ( aq ) + KCl ( aq ) ⇒ AgCl ( pre ) + KNO₃ ( aq )

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.