Potassium dichromate `(K_(2)Cr_(2)O_(7))` is an orange coloured compound , very frequently used in laboratory as an oxidising agent as well as in a redox titration. It is generally prepared from chromite `(FeCr_(2)O_(4))` ore according to the following reactions:
(1) Fusion of chromite ore with sodium carbonate in excess of air.
`FeCr_(2)O_(4) + Na_(2)CO_(3) + O_(2) rarr Na_(2)CrO_(4)+Fe_(2)O_(3) +CO_(2)`
(2) Acidifing filtered sodium chromate solution with sulphuric acid.
`Na_(2)CrO_(4) + H_(2)SO_(4) rarr Na_(2)Cr_(2)O_(7) + Na_(2)SO_(4) + H_(2)O`
(3) Treating sodium dichormate with potassium choride .
`Na_(2)Cr_(2)O_(7) + KCl rarr K_(2)Cr_(2)O_(7) + NaCl`
If whole of the chormite ore given in the previous question gets consumed and sufficient amount of rest of the reactants are given, then the mass of `K_(2)Cr_(2)O_(7)` obtained is:

Options

A. 14.7 gm
B. 7.35 gm
C. 73.5 gm
D. 147 gm

Answer

C