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Question

Which of the following is correct for indentification of the polyacidic bases and polybasic acids respectively?

A
H3PO4 and B(OH)3
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B
Mg(OH)2 and B(OH)3
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C
Mg(OH)2 and H2SO4
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D
NaOH and H3PO4
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Solution

The correct option is C Mg(OH)2 and H2SO4
  • Polybasic acids are those when dissolved in water they ionize and give rise to more than one proton.
  • Polyacidic bases are those which release more than one OH ions per molecule of base in aqueous solution.
  1. H3PO4 is a polybasic acid, as it has more than ionizable H+ ions and B(OH)3 is actually a weak acid which reacts with H2O and gives one H+ and B(OH)4 ion. So, it is incorrect.
  2. Mg(OH)2 is a poly acidic base as it has more than one ionizableOH ions. But B(OH)3 acts as a weak monobasic acid.So , it is incorrect.
  3. Mg(OH)2 is a polyacidic base and H2SO4 is polybasic acid as it has more than one ionizable protons. So, it is correct.
  4. NaOH is a not polyacidic base as it has only one replacable hydroxyl ion and H3PO4 is polybasic acid as it has three ionizable protons. So, it is correct.

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