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A gas that will turn orange potassium heptaoxodichromate ...

A gas that will turn orange potassium heptaoxodichromate (lV) solution to clear green is?

A.

sulphur (ii) oxide

B.

hydrogen sulphide

C.

sulphide (lV) oxide

D.

hydrogen chloride

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Correct answer is A

No explanation has been provided for this answer.

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