Question

A compound 'X' is a constituent of baldng power. It is used as an antacid When 'X' is heated it gives out a gas "V which when passed through lime water turns it milky and a salt 'Z' is formed which is the main constituent of washing power. Identify X, Y and Z Write balanced chemical equations for the reactions involved

CBSE Class X Science SA 2 (3 Marks)

Answer 1

Answer:

X NaHCO3

Y CO2

Z NA2CO3

Explanation:

These are X Y and Z

Answer 2

Answer:

X is sodium bicarbonate (NaHCO3)

V is carbon dioxide (CO2)

Z is sodium carbonate (Na2CO3)

The reactions involved are as follows:

2NaHCO3  →  Na2CO3 + H2O + CO2

CO2 + Ca(OH)2 (lime water)  →  CaCO3 + H2O

Sodium bicarbonate is called baking soda. Sodium bicarbonate is one of the main components of baking powder. It is also used as an antacid. On heating sodium bicarbonate, sodium carbonate, water, and carbon dioxide are formed.

When carbon dioxide is passed through lime water, it turns lime water milky. Sodium carbonate formed on the heating of sodium bicarbonate is called washing soda. It is the main component of washing powder.