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Standard VII
Chemistry
Question

Which of the following statements is true?
  1. Spoiling of food is a chemical and irreversible change.
  2. Setting of milk to form curd is a chemical and reversible change.
  3. Burning paper is a physical and reversible change.
  4. Boiling of an egg is a physical and reversible change.

A
Setting of milk to form curd is a chemical and reversible change.
B
Spoiling of food is a chemical and irreversible change.
C
Burning paper is a physical and reversible change.
D
Boiling of an egg is a physical and reversible change.
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Solution
Verified by Toppr

Chemical change always produces a new substance and cannot be reversed. The setting of milk to curd, burning of paper, and boiling of egg all are chemical changes and cannot be reversed. In the options, the changes are considered to be reversible, so these statements are not true. Spoiling of food is a chemical change and cannot be reversed. Hence the correct statement is B.

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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


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Q2

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Q3
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