Page No 33: - Chapter 2 - Acids Bases & Salts - Ncert Solutions class 10 - Science

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Question 1:

What is the common name of the compound CaOCl₂?

Answer:

The common name of the compound CaOCl₂ is bleaching powder.

Question 2:

Name the substance which on treatment with chlorine yields bleaching powder?

Answer:

Calcium hydroxide [Ca (OH)₂], on treatment with chlorine, yields bleaching powder.

Question 3:

Name the sodium compound which is used for softening hard water.

Answer:

Washing soda (Na₂CO₃.10H₂O) is used for softening hard water.

Question 4:

What will happen if a solution of sodium hydrocarbonate is heated? Give the equation of the reaction involved.

Answer:

When a solution of sodium hydrocarbonate (sodium hydrogencarbonate) is heated, sodium carbonate and water are formed with the evolution of carbon dioxide gas.

Question 5:

Write an equation to show the reaction between Plaster of Paris and water.

Answer:

The chemical equation for the reaction of Plaster of Paris and water can be represented as