In an acidic medium dichromate ion oxidises ferrous ion to ferric ion. If the gram molecular mass of potassium dichromate is 294 g, its gram equivalent mass is........ Grams.

Options

A. `294`
B. `127`
C. `49`
D. `24.5`

Answer

C

Explanation

In acidic medium,
`underset(("O.N. of Cr=6"))(Cr_(2)O_(7)^(2-))+14H^(+) to underset(("O.N. of Cr=3"))(2C^(3+)+7H_(2))O-6e^(-)`
Eq. mass of `K_(2)Cr_(2)O_(7)` in acidic medium
`=("molecular mass")/(6) = (294)/(6) = 49`