1
COMEDK 2025 Evening Shift
MCQ (Single Correct Answer)
+1
-0
The oxidation number of potassium in $\mathrm{K}_2 \mathrm{O}, \mathrm{K}_2 \mathrm{O}_2$ and $\mathrm{KO}_2$ respectively are:
2
COMEDK 2025 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0
Given below are 2 statements: one Assertion and the other Reason. Which one of the following options is correct?
Assertion : Sulphur dioxide and Hydrogen peroxide can act as both oxidising and reducing agents but Nitric acid can act as only oxidising agent.
Reason : Sulphur and Oxygen can exhibit more than one stable oxidation states while Nitrogen does not.
3
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
Choose the correct statement.
4
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
The concentration and percentage purity of Oxalic acid can be determined by titration with $\mathrm{KMnO}_4$ in presence of dil. $\mathrm{H}_2 \mathrm{SO}_4$. Instead of dil. $\mathrm{H}_2 \mathrm{SO}_4$, dil HCl cannot be used because
Questions Asked from Redox Reactions (MCQ (Single Correct Answer))
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