Question

Tick the correct options: burning of coal is a/an................ change.

• A. reversible
• B. irreversible
• C. natural
• D. human - made

Answer 1

The correct option is B

irreversible

Explanation for correct option

(B)irreversible

Irreversible change

• A change is called irreversible if it cannot be changed back again.
• It involves the making or breaking of bonds between atoms.

Burning of coal

• When coal is burned, it undergoes a chemical transformation that produces new substances like carbon dioxide and water.
• So, the burning of coal is a chemical change.
• The chemical change is an irreversible change.
• So, the burning of coal is an irreversible change.

Explanation for incorrect option

(A)

Reversible change

• The changes which can be observed and specified like changes in color, hardness, rigidity, fluidity, density, melting point, boiling point etc. are the physical changes.

(C)

• Natural changes are those that occur as a result of nature alone, independent of human intervention.

(D)

• The changes which are brought about by humans are called human-made changes.

The burning of coal is an irreversible change. Hence, options (A), (C), and (D) are incorrect.

Hence, option (B) is correct. The burning of coal is an irreversible change.