21 JEE Main 2021 Redox Reactions previous-year questions with verified answers and step-by-step solutions.
These are the JEE Main 2021 previous-year questions from the Redox Reactions chapter of Chemistry. Each links to a full solution with a verified answer key. To see the whole chapter across all years, visit the Redox Reactions chapter hub.
The oxidation states of ' P ' in H 4 P 2 O 7 ,   H 4 P 2 O 5 and H 4 P 2 O 6 , respectively, are :
10 . 0   mL of 0 . 05   M   KMnO 4 solution was consumed in a titration with 10 . 0   mL of given o…
The oxidation states of nitrogen in NO ,   NO 2 ,   N 2 O and NO 3 - are in the order of :
250   mL of 0 . 5 M   NaOH was added to 500   mL of 1 M HCl . The number of unreacted HCl molecules in t…
Identify the process in which change in the oxidation state is five :
In mildly alkaline medium, thiosulphate ion is oxidized by MnO 4 - to " A " . The oxidation state of sulphur in…
Dichromate ion is treated with base, the oxidation number of Cr in the product formed is
When 10   mL of an aqueous solution of Fe 2 + ions was titrated in the presence of dil H 2 SO 4 using diphenylamin…
Cu 2 + salt reacts with potassium iodide to give
In polythionic acid, H 2   S x O 6 ( x = 3 to 5 ) the oxidation state(s) of sulphur is/are:
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