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To an acidified dichromate solution, a p...

To an acidified dichromate solution, a pinch of `Na_(2)O_(2)` is added and shaken.
`Na_(2)Cr_(2)O_(7) +4Na_(2)O_(2)+5H_(2)SO_(4) to 2(A)+5(B)+5H_(2)O`.
Compound (A) is blue coloured
The sum of the total number of atoms in one molecule of (A) and (B) is

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The correct Answer is:
13
Blue colour is due to the formation of `CrO_(5)`
`Na_(2)Cr_(2)O_(7)+4Na_(2)O_(2)+5H_(2)SO_(4) to 2CrO_(5)+5Na_(2)SO_(4)+5H_(2)O`.
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