1
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 $$\mathrm{S}_4 \mathrm{O}_6^{2-}$$
2
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
3
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
4
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
$$ \mathrm{A}_3 \mathrm{B}_6 \mathrm{C}_2 $$
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