Question

Give one example each of a chemical reaction showing the following characteristic.
1. Evolution of gas
2. Change of colour
3. Formation of precipitate
4. Change of state from liquid to gas
5. Change of state frome gas to liquid

Answer 1

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.

Answer 2

We are required to give one example of a chemical reaction that shows the following characteristics. The examples showing the characteristics will be given as under:

• Evolution of gas - A reaction between zinc granules and diluted sulfuric acid results in the production of hydrogen gas bubbles. In this way, the evolution of hydrogen gas is a distinctive feature of the chemical reaction between zinc and diluted sulfuric acid.
• Change of color - The interaction between a solution of potassium iodide and a solution of lead nitrate. The reaction described above changes from colorless to yellow.
• Formation of a precipitate-The chemical reaction between potassium chloride and silver nitrate, in which solid silver chloride is precipitated out, is one of the greatest examples of precipitation reactions. This is the precipitation reaction's byproduct, the insoluble salt.
• Change of state from liquid to gas - When we boil water the liquid ( water) turns into a gas( water vapor). This process can be referred to as or can be called evaporation.
• Change of state from gas to liquid - Condensation is the process through which matter transitions from its initial gaseous state into its final liquid state. For instance, condensation happens when water vapor in the air, which is in its gaseous form, comes into touch with a cooler surface and turns into liquid water.

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