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 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

In the reaction,

$$2 \mathrm{~S}_2 \mathrm{O}_3^{2-}+\mathrm{I}_2 \rightarrow \mathrm{S}_4 \mathrm{O}_6^{2-}+2 \mathrm{I}^{-}$$

A
$$\mathrm{S}_2 \mathrm{O}_3^{2-}$$ gets oxidised to $$\mathrm{S}_4 \mathrm{O}_6^{2-}$$
B
$$\mathrm{I_2}$$ is a reducing agent
C
$$\mathrm{I}_2$$ get oxidised to $$\mathrm{I}^{-}$$
D
$$\mathrm{S}_2 \mathrm{O}_3^{2-}$$ gets reduced to $$\mathrm{S}_4 \mathrm{O}_6^{2-}$$
3
COMEDK 2024 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

When $$3.92 \mathrm{~g}$$ of Mohr salt is dissolved in $$100 \mathrm{~mL}$$ of water, and titrated against $$\mathrm{KMnO}_4$$ solution, $$20 \mathrm{~mL}$$ of this solution required $$18 \mathrm{~mL}$$ of $$\mathrm{KMnO}_4$$ for complete oxidation. The strength of $$\mathrm{KMnO}_4$$ is: [Molar mass of Mohr salt is $$392 \mathrm{~g} \mathrm{~mol}^{-1}$$ and $$\mathrm{KMnO}_4$$ is $$158 \mathrm{~g} \mathrm{~mol}^{-1}$$]

A
3.5 g/L
B
1.8 g/L
C
2.5 g/L
D
4.2 g/L
4
COMEDK 2024 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

Identify the oxidation reaction in which acidified $$\mathrm{KMnO}_4$$ is required

A
Conversion of iodide ions to iodine
B
Oxidation of iodide ions to iodate ions
C
Oxidation of manganous salt to manganese dioxide
D
Conversion of thiosulphate ions to sulphate ions
COMEDK Subjects
EXAM MAP