...... is the process of absorption of moisture from air.

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Question

RRB NTPC - 2015

General Science

...... is the process of absorption of moisture from air.

This question was previously asked in

RRB NTPC 2015 CBT 1 Question Paper PDF (2-Apr-2016) (Shift 3)

Deli ques c en ce

Capillary action

Absorption

Osmosis

The correct answer is

Deli ques c en ce

Deliquescence is the process in which a hygroscopic solid absorbs moisture from the atmosphere until it dissolves in the absorbed water to form a saturated solution.

Substances like NaOH, CaCl$_2$ and anhydrous MgCl$_2$ are classic examples of deliquescent solids.

Capillary action is the rise of liquid in narrow tubes, osmosis is solvent movement across a semipermeable membrane and absorption is a general bulk uptake term — none specifically names moisture pickup from air.

Hence, Deliquescence.

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