Question 7

Neutralisation reaction is a
(a) physical and reversible change.
(b) physical change that cannot be reversed.
(c) chemical and reversible change.
(d) chemical change that cannot be reversed.

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Solution

Neutralisation reaction is a chemical reaction between acid and base resulting in the formation of a salt and water. The reaction is chemical in nature and cannot be reversed.

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Question 8

Paheli’s mother made a concentrated sugar syrup by dissolving sugar in hot water. On cooling, crystals of sugar got separated. This indicates a:
(a) physical change that can be reversed
(b) chemical change that can be reversed
(c) physical change that cannot be reversed
(d) chemical change that cannot be reversed

Q. Give two examples for each of the following cases:
(a) Physical changes that are reversible
(b) Physical changes that are not reversible
(c) Chemical changes

Which of the following can be classified into physical and chemical change? Also mention whether it's a reversible or irreversible change

Four students have their own opinion about reversible and irreversible changes. Who among the following is correct?

Rohan: Both physical and chemical changes are reversible.

Sam: Both physical and chemical changes are irreversible.

Tom: Physical changes are irreversible and chemical changes are reversible.

Riah: Chemical changes are irreversible and physical changes are reversible

Give reason:

(a)Freezing of water to ice and evaporation of water are physical changes.

(b)Burning of a candle is both a physical and a chemical change.

(c)Burning of paper is a chemical change.

(d)Cutting of a cloth piece is a physical change, though it cannot be reversed.

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Chemical Change

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Question 7 Neutralisation reaction is a (a) physical and reversible change. (b) physical change that cannot be reversed. (c) chemical and reversible change. (d) chemical change that cannot be reversed.

Neutralisation reaction is a chemical reaction between acid and base resulting in the formation of a salt and water. The reaction is chemical in nature and cannot be reversed.

Question 7

Neutralisation reaction is a
(a) physical and reversible change.
(b) physical change that cannot be reversed.
(c) chemical and reversible change.
(d) chemical change that cannot be reversed.