Question

Which of the following is not an example of physical change ?
(1) Dissolving sugar in water
(2) Casting iron in moulds
(3) Setting of cement
(4) Magnetisation of iron

Answer 1

Answer:

3

Explanation:

settings of cement is a chemical Change as it is irreversible

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Answer 2

(3) Setting of cement not an example of physical change.

What is a physical change?

• The state or form of substance changes in a physical change.
• There is no change in chemical composition while physical change occurs.

Dissolving sugar in water:

• Sugar as solid solute particles gets dissolved and disappears in a water solution.
• It is a physical change as the form of mixtures changes and can be visibly seen.

Casting iron in moulds:

• Moulding of iron a direct physical change as the iron is moulded into different shape and sizes which is physically visible.

Setting of cement:

• When cement mixture is prepared and kept for setting down, it hardens up by undergoing chemical transformation and thus comes under chemical change.

Magnetisation of iron:

• It is a physical change as the iron starts to attract magnetic material and it comes under physical change.