JEE Main 2021ChemistryIonic EquilibriumEasyNumerical

JEE Main 2021Ionic Equilibrium Question with Solution

JEE Main 2021 (26 Feb Shift 2)

Question

The pH of ammonium phosphate solution, if pka of phosphoric acid and pkb of ammonium hydroxide are 5.23 and 4.75 respectively, is

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Show full solutionCorrect answer: 7
Correct answer
7

Step-by-step explanation

Since NH43PO4 is salt of weak acid H3PO4 and weak base NH4OH

pH=7+12pka-pkb

=7+125.23-4.75

=7.247

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About this question

This is a previous-year question from JEE Main 2021, covering the Ionic Equilibrium chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.