Question

The information given below describes the properties of a certain type of mixture.

1. The particle size is around ${10}^{-7}$ m.
2. The constituent particles cannot be separated by filtration.
3. When a laser beam is passed through it, it clearly shows the path of the laser beam.

Which amongst the following shows the given properties?

• A. Blood
• B. Copper wire
• C. Salt solution
• D. Hydrogen balloon

Answer 1

The correct option is A Blood

Colloid is a heterogeneous mixture in which particle size is between ${10}^{-6}$ and ${10}^{-9}$ m. Due to this,
1. They cannot be separated by filtration.
2. The path of laser beam passed through it will be visible as the particles are big enough to scatter the laser beam.

Amongst the given options, the only colloid is blood. Copper wire contains only the element copper. Hydrogen balloons contain only hydrogen gas $\left(H_2\right)$ in it, which is an element. However, salt solution is a true solution as salt completely dissolves in water.