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  4. The normality of 0.3 M phosphorus acid (H3PO3) is

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Q. The normality of $0.3\, M$ phosphorus acid $(H_3PO_3)$ is

IIT JEEIIT JEE 1999Some Basic Concepts of Chemistry

Solution:

Phosphorus acid is a dibasic acid as :
image
only two replaceable hydrogens
Therefore, normality $=$ molarity $\times$ basicity $= 0.3 \times 2 = 0.60$