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Question

Which of the following pairs do not have the same nature?


  1. B(OH)3,H3PO3

  2. Be(OH)2,Al(OH)3

  3. B(OH)3,Al(OH)3

  4. Mg(OH)2,NaOH

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Solution

The correct option is C

B(OH)3,Al(OH)3


  • If a compound donates a proton (H+) or accepts a pair of electrons in an aqueous solution then it is classified into acids.
  • If a compound donates OH- or accepts a proton H+ or donates a pair of electrons in an aqueous solution then it is classified into bases.
  • Based on the nature of the compounds we can classify them as acid or base.

The explanation for the correct option:

Option C:

  • Option C, B(OH)3 is acidic in nature.
  • Al(OH)3 is amphoteric in nature, it acts as both an acid and a base.
  • Thus, these molecules do not have the same nature.
  • Hence, option C is correct.

The explanation for the incorrect options:

Option A:

  • In case (a) B(OH)3, it accepts OH- from water and hence we can classify it as acid.
  • H3PO3 is a phosphoric acid as it releases H+ in the solution and hence we can classify it as acid.
  • Both B(OH)3, and H3PO3 act as acids.

Option B:

  • In Case (b) Be(OH)2, it is an amphoteric in nature as it reacts with both acid and alkali.
  • Al(OH)3 , is amphoteric in nature, it acts as both an acid and a base.
  • Both Be(OH)2, and Al(OH)3act as amphoteric hydroxides.

Option D:

  • Mg(OH)2, magnesium is an alkaline earth metal, it donates OH- in the solution so it acts as a base.
  • In NaOH, sodium acts as an alkali metal, it donates OH- in the solution so it acts as a base.
  • Both Mg(OH)2 and NaOH act as a base. Hence both compounds have some nature. So D is the incorrect option.

Hence option (C) is the correct option.


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