Tag: changes and their classification

Questions Related to changes and their classification

Properties like shape, magnetic properties etc. are changed in:

chemistry change around us physical changes changes and their classification physical changes

  1. chemical change

  2. physical change

  3. Both A and B

  4. None of the above

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Correct Option: B
Explanation:

During a physical change, physical properties such as colour, volume, size, shape and magnetic properties etc. of the substances may change.

Dissolution of common salt or sugar in water is an example of:

chemistry change around us physical changes changes and their classification physical changes

  1. physical change

  2. chemical change

  3. both A and B

  4. none of the above

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Correct Option: A
Explanation:

A change in which only the physical properties of the substance get changed, when the chemical composition remain unchanged is called a physical change. Here we can obtain the sugar by boiling water.

Example of the physical change is :
chemistry change around us physical changes changes and their classification physical changes

  1. respiration (inhaling oxygen gas and exhaling carbon dioxide gas)

  2. mixing vinegar and baking soda

  3. evaporating water

  4. burning fuel in your car

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Correct Option: C
Explanation:

In evaporation of water, only the physical state of water changes from liquid to gas, but not the chemical composition of water.

Hence the correct answer is option C.

When salt is dissolved in a glass of water, how many new substances are formed?

chemistry change around us physical changes changes and their classification physical changes

  1. $1$

  2. $2$

  3. $3$

  4. None

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Correct Option: B

Which of the following is a physical change?

chemistry change around us physical changes changes and their classification physical changes

  1. Magnetisation of iron

  2. Curdling of milk

  3. Burning of a candle

  4. Cooking of food

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Correct Option: A
Explanation:

Magnetization of iron is a physical change and not a chemical change as there is no change of state, no change of temperature, no smell and no evolution of gas. It is because: - No Chemical process is involved. - After demagnetizing the iron it will lose its magnetic power.

Which of the following is not a physical change?

chemistry change around us physical changes changes and their classification physical changes

  1. Tearing a paper

  2. Bending an iron rod

  3. Freezing water into ice

  4. Curdling of milk

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Correct Option: D
Explanation:

Tearing of paper is a physical change because it remains same. Tearing of a paper is a physical change because when the paper is torn only the appearance of the paper is changed and no new substance is formed.

Cheese is made when an enzyme called rennet is added to milk. The rennet causes a chemical reaction where the milk solids curdle, separating themselves from the whey, or liquid portion of the milk

When a substance has changes in its physical properties than it is known as:

chemistry change around us physical changes changes and their classification physical changes

  1. Structural change

  2. Biological change

  3. Physical change

  4. Chemical change

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Correct Option: C
Explanation:

Change in only physical properties is known as physical change.

Which one of the following is a reversible change?

chemistry change around us physical changes changes and their classification physical changes

  1. cutting wood in pieces

  2. blooming of flowers

  3. melting of ice

  4. the burning of a candle

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Correct Option: C
Explanation:

Melting of ice is a physical change in which substance changes its physical state but not properties.


 Hence it is a reversible change in which melted ice can freeze again by decrease in temperature.

Hence the option C is correct.

Properties such as shape, size, colour and state of a substance are called it's:

chemistry change around us physical changes changes and their classification physical changes

  1. chemical properties

  2. physical properties

  3. chemical changes

  4. none of these

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Correct Option: B
Explanation:

Properties such as shape, size, colour and state of a substance are called its physical properties.A physical change is generally reversible. In such a change no new substance is formed.

Which of the following is a physical change?

chemistry change around us physical changes changes and their classification physical changes

  1. Rusting of Iron.

  2. The burning of coal

  3. Cooking food

  4. Converting ice in the water

Show answer
Correct Option: D
Explanation:

Change in the state between solid, liquid and gas is a physical change because Properties such as shape, size, colour and state of a substance are called its physical properties which are reversible.


Hence the option D is correct.