1
JEE Main 2024 (Online) 31st January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Identify the factor from the following that does not affect electrolytic conductance of a solution.

A
The nature of solvent used.
B
The nature of the electrolyte added.
C
The nature of the electrode used.
D
Concentration of the electrolyte.
2
JEE Main 2024 (Online) 30th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Alkaline oxidative fusion of $$\mathrm{MnO}_2$$ gives "A" which on electrolytic oxidation in alkaline solution produces B. A and B respectively are

A
$$\mathrm{Mn}_2 \mathrm{O}_3$$ and $$\mathrm{MnO}_4^{2-}$$
B
$$\mathrm{Mn}_2 \mathrm{O}_7$$ and $$\mathrm{MnO}_4^{-}$$
C
$$\mathrm{MnO}_4^{2-}$$ and $$\mathrm{MnO}_4^{-}$$
D
$$\mathrm{MnO}_4^{2-}$$ and $$\mathrm{Mn}_2 \mathrm{O}_7$$
3
JEE Main 2024 (Online) 30th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Reduction potential of ions are given below:

$$\begin{array}{ccc} \mathrm{ClO}_4^{-} & \mathrm{IO}_4^{-} & \mathrm{BrO}_4^{-} \\ \mathrm{E}^{\circ}=1.19 \mathrm{~V} & \mathrm{E}^{\circ}=1.65 \mathrm{~V} & \mathrm{E}^{\circ}=1.74 \mathrm{~V} \end{array}$$

The correct order of their oxidising power is :

A
$$\mathrm{IO}_4^{-}>\mathrm{BrO}_4^{-}>\mathrm{ClO}_4^{-}$$
B
$$\mathrm{BrO}_4^{-}>\mathrm{ClO}_4^{-}>\mathrm{IO}_4^{-}$$
C
$$\mathrm{ClO}_4^{-}>\mathrm{IO}_4^{-}>\mathrm{BrO}_4^{-}$$
D
$$\mathrm{BrO}_4^{-}>\mathrm{IO}_4^{-}>\mathrm{ClO}_4^{-}$$
4
JEE Main 2024 (Online) 27th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Which of the following statements is not correct about rusting of iron?

A
Rusting of iron is envisaged as setting up of electrochemical cell on the surface of iron object.
B
Dissolved acidic oxides $$\mathrm{SO}_2, \mathrm{NO}_2$$ in water act as catalyst in the process of rusting.
C
Coating of iron surface by tin prevents rusting, even if the tin coating is peeling off.
D
When $$\mathrm{pH}$$ lies above 9 or 10, rusting of iron does not take place.
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