Question

ASSERTION (A) : Sand in water is a suspension, REASON (R) : The particle size of sand in water mixture is less than 1 nm *​

Answer 1

Correct option is

B

Assertion is wrong but Reason is correct

Tyndall effect is light scattering by particles in a colloid or particles in a fine suspension. So, a true solution does not show Tyndall effect due to scattering of light and scattering is directly proportional to size of sol particles.

Hence, assertion is wrong but reason is correct.

Answer 2

The assertion is correct but reason is wrong.

• Suspension is a heterogeneous mixture of solid particles in liquid. Some example of suspension are wheat in water, flour in water etc.
• Thus sand in water is a heterogeneous mixture and it is a suspension.
• The particle size of suspension is between 1mm to 50mm.
• Thus the size of sand particle in water must be between 1 micro meter to 50 micro meter.