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1
COMEDK 2025 Evening Shift
MCQ (Single Correct Answer)
+1
-0
An example of disproportionation reaction is :
A
$2 \mathrm{H}_2 \mathrm{O}_2 \rightarrow 2 \mathrm{H}_2 \mathrm{O}+\mathrm{O}_2$
B
$2 \mathrm{KMnO}_4 \rightarrow \mathrm{~K}_2 \mathrm{MnO}_4+\mathrm{MnO}_2+\mathrm{O}_2$
C
$2 \mathrm{MnO}_4^{-}+10 \mathrm{I}^{-}+16 \mathrm{H}^{+} \rightarrow 2 \mathrm{Mn}^{2+}+5 \mathrm{I}_2+8 \mathrm{H}_2 \mathrm{O}$
D
$2 \mathrm{NaI}+\mathrm{Cl}_2 \rightarrow 2 \mathrm{NaCl}+\mathrm{I}_2$
2
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:
A
$+1,+2,+4$
B
$+1,+2,+1$
C
$+1,+1,+1$
D
$+2,+1,+1$
3
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.

A
Assertion is correct but Reason is wrong.
B
Both Assertion and Reason are wrong.
C
Both Assertion and Reason are correct.
D
Assertion is wrong but Reason is correct.
4
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
Choose the correct statement.
A
Calcium and Magnesium metals are manufactured by electrolysis of aqueous solutions of their salts
B
The oxo-anion $\mathrm{ClO}_3^{-}$does not undergo disproportionation reaction
C
Nitride ion $\mathrm{N}^{-3}$ cannot act as an oxidising agent
D
In alkaline medium the reduction of $\mathrm{MnO}_4^{-}$ion involves gain of 5 electrons
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