English Medium Class 10 - CBSE Question Bank Solutions

What are detergents chemically? List two merits and two demerits of using detergents for cleansing. State the reason for the suitability of detergents for washing, event in the case of water having calcium and magnesium ions.

What is a soap?

Why are soaps not suitable for washing clothes when the water is hard?

Explain the action of soap in removing an oily spot from a piece of cloth.

Distinguish between esterification and saponification reactions of organic compounds.

Answer the following question.
In three test tubes A, B, and C, three different liquids namely, distilled water, underground water and distilled water in which a pinch of calcium sulphate is dissolved, respectively are taken. Equal amount of soap Answer is added to each test tube and the contents are shaken. In which test tube will the length of the foam (lather) be longest? Justify your answer.

What is the difference between soaps and detergents? State, in brief, the cleansing action of soaps in removing an oily spot from a fabric. Why are soaps not very effective when a fabric is washed in hard water? How is this problem resolved?

Soaps are ester of which type of acids?

The period during adolescence when the reproductive tissues begin to mature is called ______ 

The embryo in humans gets nutrition from the mother’s blood with the help of a special tissue called ______ 

The fertilization of the human egg by the sperm takes place in ______  

The ability to reproduce is lost in a female after ______ 

When sperm is deposited into the vagina which route does it travel?

When the foetus is growing inside the uterus it needs nutrients. Which part provides these nutrients?

What marks the beginning of the reproductive life of a woman?

Where does fertilization take place? 

Tubectomy is carried out by blocking the ______ 

Fertilization occurs in human females when the sperms and ovum reach simultaneously at ______

The soap molecule has a

In the soap micelles