Question

Statements given below are incorrect. Write the correct statements.
1. Digestion of food is a physical change.
2. Magnetisation of steel is a chemical change.
3. Rusting can be stopped by adding metals like aluminium and copper to iron.
4. Crystallisation is the process used to make impure substances from the pure substances
5. Limewater turns milky in presence of carbon dioxide gas, due to the formation of calcium sulphate.
6. The reaction between magnesium and oxygen produces heat and sound energy.

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Answer 1

1. Digestion of food is chemical change.
2. Magnetisation of steel is a physical change.
3. Rusting can be stopped by galvinization.
4. Crystallization is defined as a process by which a chemical is converted from a liquid solution to a solid crystalline state.
5. Limewater is a solution of calcium hydroxide. If carbon dioxide is bubbled through limewater, the limewater turns milky or cloudy
6. Limewater is a solution of calcium hydroxide. If carbon dioxide is bubbled through limewater, the limewater turns milky or cloudy

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Answer 2

Answer:

Digestion of food is chemical change.

Magnetisation of steel is a physical change.

Rusting can be stopped by galvinization.

Crystallization is defined as a process by which a chemical is converted from a liquid solution to a solid crystalline state.

Limewater is a solution of calcium hydroxide. If carbon dioxide is bubbled through limewater, the limewater turns milky or cloudy

Limewater is a solution of calcium hydroxide. If carbon dioxide is bubbled through limewater, the limewater turns milky or cloudy

Explanation:

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