Acidified potassium dichromate is treated with hydrogen sulphide. In the reaction,the oxidation number of chromium
- AIncreases from $+3$ to $+6$
- BDecreases from $+6$ to $+3$
- CRemains unchanged
- DDecreases from $+6$ to $+2$
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In the following reaction,assign the correct category for the underlined atom based on the product of complete hydrolysis at $R.T.$:
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