The difference in oxidation state of chromium in chromate and dichromate salts is $....$ .
- A$1$
- B$0$
- C$2$
- D$3$
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In the following reaction,assign the oxidation state of the underlined atom for the product of complete hydrolysis at $R.T.$:
$H\underline{N}O_4 + H_2O \longrightarrow HNO_3 + H_2O_2$
$H\underline{N}O_4 + H_2O \longrightarrow HNO_3 + H_2O_2$
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When $KMnO_4$ is reduced with oxalic acid in acidic solution,the oxidation number of $Mn$ changes from
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