Question

Which of the following is an example of absorption?

• A. Oxygen on metal surface
• B. Water on calcium chloride
• C. Water on silica gel
• D. Hydrogen on finely divided nickel

Answer 1

The correct option is B

Water on calcium chloride

Absorption means penetration of adsorbate molecules into the bulk of the adsorbent e.g., water on calcium chloride.

When water is spread over calcium chloride, it gets penetrated into the bulk of the calcium chloride.

Hence the answer is $\left(B\right).$

Silica gel, finely divided nickel and metal surface all have a porous structure which makes them good adsorbents.

Thus, they facilitate the adsorption process.

Hence, options $\left(A\right),\left(C\right)$ and $\left(D\right)$ are wrong.