Question

10. The number of moles of Cr2O72- required to react with two moles of sulphite ion in acidic solution is
(1)1/3
(2) 1
(3)2/3
(4)2/5
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Answer 1

Answer:

the answer must be 2/3

Explanation:

see the attachment

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Answer 2

Answer

3)2/3  is the correct answer

Cr2O72– + 3SO32– + 8H+→ 2Cr3+ +3SO42– + 4H2O