Question

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

Answer 1

Correct Answer - C
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`