Question

The questions below consist of Assertion (A) and Reason (R). Use the following key to select the correct answer:

(a) If both assertion and reason are correct and the reason is the correct explanation for the assertion.

(b) If both assertion and reason are correct but the reason is not the correct explanation for the assertion.

(c) If the assertion is correct but the reason is incorrect.

(d) If the assertion is incorrect but the reason is correct.

Assertion: Smoke is a colloidal solution in which dust particles i.e. carbon particles are suspended in the air.

Reason: Smoke may be regarded as an aerosol.

• A. (a)
• B. (b)
• C. (c)
• D. (d)

Answer 1

The correct option is A

(a)

Explanation for correct option (a):

• The given assertion that smoke is a colloidal solution in which dust particles i.e. carbon particles are suspended in the air is correct. Smoke is a colloidal solution in which dispersing medium is the air and the dust particles are the dispersed phase.
• The given reason that smoke may be regarded as an aerosol is correct. It is the correct explanation of the given assertion as aerosols are the types of colloidal solution in which dispersing medium is the gas (air) and the dispersed phase is the solid (dust particles).