The salt `KHC_(2)O_(4)H_(2)C_(2)O_(4).4H_(2)O` may be used as reducing agent as well as an acid. Choose the correct option (S):

Options

A. The equivalent weight of the salt is 72.5 g-`"equivalent"^(-1)`, when reacted with acidified `KMnO_4` solution.
B. The equivalent weight of the salt is 145 g-`"equivalent"^(-1)` , when reacted with NaOH solution,
C. The volume of `CO_2` liberated at STP by 1 g of salt when reacted with excess of acidified `KMnO_4` is 309 ml.
D. The number of ionizable hydrogen ion is one.

Answer

A, C

Explanation

With `KMnO_4` the given salt act as reducing agent . So for each oxalate ion it.s n-factor is 2. So total salt n-factor is 4 and Oxalate ion releases `CO_2` When it reacts with NaOH, it shows acidic nature. The salt has basicity 3.