1
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

In the redox reaction between $$\mathrm{Cr}_2 \mathrm{O}_7^{2-} / \mathrm{H}^{+}$$ and sulphite ion, what is the number of moles of electrons involved in producing 3.0 moles of the oxidised product?

A
8
B
2
C
3
D
6
2
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

An inorganic salt comprises of atoms of elements $$\mathrm{A}, \mathrm{B}$$ and $$\mathrm{C}$$. If the oxidation numbers of A, B and $$\mathrm{C}$$ are $$+3,+6$$ and $$-$$2 respectively, what is the possible formula of the compound?

A
$$ \mathrm{A}_3\left(\mathrm{BC}_3\right)_4 $$
B
$$ \mathrm{A}_2\left(\mathrm{BC}_4\right)_3 $$
C
$$ \mathrm{A}_3(\mathrm{BC})_2 $$
D
$$ \mathrm{A}_3 \mathrm{B}_6 \mathrm{C}_2 $$
3
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

Choose the group of ions / molecules in which none of the species undergo Disproportionation reaction.

A
$$\mathrm{F}_2, \mathrm{ClO}^{-}, \mathrm{Cl}_2, \mathrm{ClO}_2^{-}$$
B
$$\mathrm{P}_4, \mathrm{H}_2 \mathrm{O}_2, \mathrm{BrO}_2^{-}, \mathrm{NO}_2$$
C
$$\mathrm{Cr}_2 \mathrm{O}_7^{2-}, \mathrm{F}_2, \mathrm{MnO}_4^{-}, \mathrm{ClO}_4{ }^{-}$$
D
$$\mathrm{ClO}_3^{-}, \mathrm{S}_8, \mathrm{ClO}^{-}, \mathrm{ClO}_4^{-}$$
4
COMEDK 2023 Morning Shift
MCQ (Single Correct Answer)
+1
-0

In dilute alkaline solution $$\mathrm{MnO}_4^{-}$$ changes to

A
$$\mathrm{MnO}_2$$
B
$$\mathrm{MnO}_4^{2-}$$
C
$$\mathrm{MnO}$$
D
$$\mathrm{Mn}_2 \mathrm{O}_3$$
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