- 1(current)
Q. No.Use the data given above to find out the most stable ion in its reduced form.
| 1. | Cl- | 2. | Cr3+ |
| 3. | Cr | 4. | Mn2+ |
Subtopic: Electrochemical Series |
69%
Level 2: 60%+
Hints
Which of the following materials will cause a change in the concentration of ZnCl₂ solution
when it is kept in a container made of them?
| 1. | Al | 2. | Cu |
| 3. | Ag | 4. | None of the above |
Subtopic: Electrochemical Series |
72%
Level 2: 60%+
AIPMT - 1998
Hints
Consider the following reactions:
\(\mathrm{MnO}_4^{-}+\mathrm{e}^{-} \rightarrow \mathrm{MnO}_4^{2-} ; E^\circ=+0.56 \mathrm{~V} \\ \mathrm{F}_2+2 \mathrm{e}^{-} \rightarrow 2 \mathrm{~F}^{-} ; E^\circ=+2.87 \mathrm{~V} \\ \mathrm{Co}^{3+}+\mathrm{e}^{-} \rightarrow \mathrm{Co}^{2+} ; E^\circ=+1.81 \mathrm{~V} \\ \mathrm{V}^{3+}+\mathrm{e}^{-} \rightarrow \mathrm{V}^{2+} ; E^\circ=-0.26 \mathrm{~V}\)
Select the correct option for increasing the order of reducing power:
1. \(\mathrm{V}^{2+}<\mathrm{MnO}_4^{2-}<\mathrm{Co}^{2+}<\mathrm{F}^{-} \)
2. \(\mathrm{MnO}_4^{2-}<\mathrm{V}^{2+}<\mathrm{Co}^{2+}<\mathrm{F}^{-} \)
3. \(\mathrm{F}^{-}<\mathrm{Co}^{2+}<\mathrm{MnO}_4^{2-}<\mathrm{V}^{2+} \)
4. \(\mathrm{Co}^{2+}<\mathrm{F}^{-}<\mathrm{MnO}_4^{2-}<\mathrm{V}^{2+} \)
\(\mathrm{MnO}_4^{-}+\mathrm{e}^{-} \rightarrow \mathrm{MnO}_4^{2-} ; E^\circ=+0.56 \mathrm{~V} \\ \mathrm{F}_2+2 \mathrm{e}^{-} \rightarrow 2 \mathrm{~F}^{-} ; E^\circ=+2.87 \mathrm{~V} \\ \mathrm{Co}^{3+}+\mathrm{e}^{-} \rightarrow \mathrm{Co}^{2+} ; E^\circ=+1.81 \mathrm{~V} \\ \mathrm{V}^{3+}+\mathrm{e}^{-} \rightarrow \mathrm{V}^{2+} ; E^\circ=-0.26 \mathrm{~V}\)
Select the correct option for increasing the order of reducing power:
1. \(\mathrm{V}^{2+}<\mathrm{MnO}_4^{2-}<\mathrm{Co}^{2+}<\mathrm{F}^{-} \)
2. \(\mathrm{MnO}_4^{2-}<\mathrm{V}^{2+}<\mathrm{Co}^{2+}<\mathrm{F}^{-} \)
3. \(\mathrm{F}^{-}<\mathrm{Co}^{2+}<\mathrm{MnO}_4^{2-}<\mathrm{V}^{2+} \)
4. \(\mathrm{Co}^{2+}<\mathrm{F}^{-}<\mathrm{MnO}_4^{2-}<\mathrm{V}^{2+} \)
Subtopic: Electrochemical Series |
75%
Level 2: 60%+
Please attempt this question first.
Hints
Please attempt this question first.
- 1(current)
Q. No.
© 2026 GoodEd Technologies Pvt. Ltd.