3 Answers

Deliquescent substances are also?

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Deliquescent substances are also?

A. efflorescent

B. anhydrous

C. hygroscopic

D. insoluble




Questions like this are a reason why you can’t score 100% in chemistry… let me explain:

A deliquescent substance is a substance that can absorb moisture from the atmosphere while also dissolving in it to form a solution.

This should not be confused with a hygroscopic substance which also absorbs water but does not dissolve in it to form a solution.

To respond to this question, please observe that anhydrous is an option lurking around.

An anhydrous substance is any pure chemical substance that does not contain water, especially water of crystallization. Anhydrous substances can be pure solids or pure liquids…

Now, deliquescent substances are initially anhydrous in their pure state, before they begin to absorb water.

Now for the right answer to the above question:

  1. Option A is incorrect. efflorescent substances are actually opposite, they loss their water of crystallization on exposure.
  2. Option B is correct. anhydrous substances are dry and pure substances that does not contain any trace of water. Deliquescent substances are initially anhydrous before they begin to absorb and dissolve in water.
  3. C is incorrect. there’s a significant difference between deliquescent and hygroscopic substances.
  4. D is not the correct answer. deliquescent substances are soluble.


You may please note these/this:

  • An anhydrous substance contains no water.
  • Both hygroscopic and deliquescent substances are initially anhydrous before they begin to absorb water.
  • Efflorescent substances are initially hydrated and not anhydrous.
  • Efflorescent substances could eventually become anhydrous when they finally loss all their water of crystallization.
  • The opposite of anhydrous is hydrated.
  • I hope you have learnt something new today.
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/ culled from 2020 JAMB-UTME chemistry past question 23 /

3 Answers

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