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Question

What is the normality of 1 M H3PO4 solution?

A
0.5 N
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B
1.0 N
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C
2.0 N
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D
3.0 N
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Solution

The correct option is D 3.0 N
1 mol of H3PO4 gives 3 moles of H+ ions

In Phosphoric acid (H3PO4) no. of H+ ions it produces on dissociation per molecule of acid is 3. Hence the n-factor for phosphoric acid H3PO4 is 3.

Normality= Molarity ×nfactor
=1× 3 =3 N

Hence, the correct option is D

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