Chemical Change

Q.

Pasteurisation of milk is

1. Physical and reversible change.

2. Chemical and reversible change.

3. Chemical and irreversible change.

4. Neither physical nor a chemical change.

Q.

Nitrogen reacts with hydrogen under high temperature and pressure and forms ammonia. Which type of change is undergone in the given example?

1. A physical change

2. A natural change

3. An electric change

4. A chemical change

Q. Upon heating a solution of salt and water, we get salt as a residue.

1. True
2. False

Q.

Food which we eat in our daily life is digested at regular intervals of time. This is a:

1. Physical change

2. Chemical change

3. No change

4. Cannot be determined

Q.

Burning of a candle is:

1. a physical change

2. a chemical change

3. a physical and a chemical change

4. biological change

Q.

Clotting of blood is an example of _____ change.

1. Physical

2. Chemical

3. Magnetic

4. Electrochemical

Q.

The process of fractional distillation is used to separate mixtures of miscible liquids.

1. True
2. False

Q.

All changes need not be ____

1. fast/slow

2. all of the above

3. desirable/undesirable

4. periodic/non-periodic

Q. Burning of wood and rusting of iron bar are examples of ___________ changes.

1. physical

2. chemical

3. physical and chemical

4. biological

Q. Which of the following is an example of a chemical change?

1. Formation of curd from milk
2. Dissolution of sugar in water
3. Cutting of paper into bits
4. Melting of an ice cube