Equivalent weight of hydrated oxalic acid is:A. 44B. 45 C. 63D. 126

To determine the equivalent weight of hydrated oxalic acid, we need to consider the chemical formula and the molar mass of the compound. The formula for oxalic acid is (COOH)₂, and its molar mass is 90.04 g/mol.

The equivalent weight is defined as the molar mass divided by the number of replaceable hydrogen atoms. In the case of oxalic acid, there are two replaceable hydrogen atoms per molecule.

Therefore, the equivalent weight of hydrated oxalic acid would be:

Equivalent weight = (Molar mass of oxalic acid) / (Number of replaceable hydrogen atoms)

Equivalent weight = 90.04 g/mol / 2 = 45.02 g/equivalent

Rounding off to the nearest whole number, the equivalent weight of hydrated oxalic acid is approximately 45.

So, the correct answer would be B. 45.