Which of the following can be considered as a chemical change?

Dissolving of an iron nail in acid.

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Breaking of ice.

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Charring of sugar.

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Dissolving alcohol in water.

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Solution

The correct options are
A Dissolving of an iron nail in acid.
C Charring of sugar.
When iron nails get dissolved in water, iron actually reacts to form salt and hydrogen gas is released. Hence this is a chemical change. Breaking of ice doesn't change the chemical composition of ice and hence it is a physical change. Charring of sugar is a chemical change as the composition of sugar gets changed. When alcohol is dissolved in water, both the components just get mixed but their composition is not changed. Hence it is a physical change.

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Q. Group the following into physical change and chemical change.

Dissolving salt in

H_{2} O,

burning of a fuel, rusting or iron, melting of ice cube.

Q. Dissolving of sugar in water is not an example for chemical reaction because:

Q. Question 1(b)
Classify the changes involved in the following processes as physical or chemical changes:

Dissolving sugar in water

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