SSC (English Medium) ७ वीं कक्षा - Maharashtra State Board Question Bank Solutions

How will you check with the help of soap powder whether water is hard? 

What is meant by ‘surface activity’?

Name three chemicals responsible for the surface activity of various detergents.

What are the differences between Soap and synthetic detergent?

What are the differences between Bath soap and soap for washing clothes?

Explain why soap cannot be used in hard water.

Explain why synthetic detergents are superior to soap.

Explain why often coloured spots are formed on clothes during washing.

What is the molecular formula of the following compound?

Hydrochloric acid

What is the molecular formula of the following compound?

Sulphuric acid

What is the molecular formula of the following compound?

Sodium chloride

What is the molecular formula of the following compound?

glucose

What is the molecular formula of the following compound?

Methane

Explain the difference between Mixture and compounds.

Give scientific reason.

In earlier times, people used to listen for the arrival of a distant train by putting their ear to the rail.

What are the similarities between Soap and synthetic detergent.

Give scientific reason.

In earlier times, people used to listen for the arrival of a distant train by putting their ear to the rail.

Give scientific reason.

In earlier times, people used to listen for the arrival of a distant train by putting their ear to the rail. 

Give scientific reasons.

In earlier times, people used to listen for the arrival of a distant train by putting their ear to the rail.

Match the pairs.