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Question

The maximum n-factor (nf) for H3PO3 and H3PO4 respectively is:

A
3,4
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B
2,3
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C
3,3
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D
3,2
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Solution

The correct option is B 2,3
nf for acid is number of H+ ions that can replaced per molecule of acid.
H3PO3 structure :


In the above structure we can see that there are two OH bonds . Both H+ can be replaced.

nf for H3PO3 is 2

H3PO4 structure:



n the above structure we can see that there are three OH bonds . All three H+ can be replaced.

nf for H3PO4 is 3

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