1
NEET 2024 (Re-Examination)
MCQ (Single Correct Answer)
+4
-1

The oxidation states not shown by Mn in given reaction is :

$$ 3 \mathrm{MnO}_4^{2-}+4 \mathrm{H}^{+} \longrightarrow 2 \mathrm{MnO}_4^{-}+\mathrm{MnO}_2+2 \mathrm{H}_2 \mathrm{O} $$

A. +6

B. +2

C. +4

D. +7

E. +3

Choose the most appropriate answer from the options given below :

A
D and E only
B
B and D only
C
A and B only
D
B and E only
2
NEET 2024
MCQ (Single Correct Answer)
+4
-1

Which reaction is NOT a redox reaction?

A
$$\mathrm{Zn}+\mathrm{CuSO}_4 \rightarrow \mathrm{ZnSO}_4+\mathrm{Cu}$$
B
$$2 \mathrm{KClO}_3+\mathrm{I}_2 \rightarrow 2 \mathrm{KIO}_3+\mathrm{Cl}_2$$
C
$$\mathrm{H}_2+\mathrm{Cl}_2 \rightarrow 2 \mathrm{HCl}$$
D
$$\mathrm{BaCl}_2+\mathrm{Na}_2 \mathrm{SO}_4 \rightarrow \mathrm{BaSO}_4+2 \mathrm{NaCl}$$
3
NEET 2023 Manipur
MCQ (Single Correct Answer)
+4
-1
Change Language

The correct option for a redox couple is:

A
Both are oxidised forms involving same element.
B
Both are reduced forms involving same element.
C
Both the reduced and oxidised forms involve same element.
D
Cathode and anode together.
4
NEET 2023
MCQ (Single Correct Answer)
+4
-1
Change Language

On balancing the given redox reaction,

$$\mathrm{aCr}_{2} \mathrm{O}_{7}^{2-}+\mathrm{bSO}_{3}^{2-}(\mathrm{aq})+\mathrm{cH}^{+}(\mathrm{aq}) \rightarrow 2 \mathrm{aCr}^{3+}(\mathrm{aq})+\mathrm{bSO}_{4}^{2-}(\mathrm{aq})+\frac{\mathrm{c}}{2} \mathrm{H}_{2} \mathrm{O}(\ell)$$

the coefficients $$\mathrm{a}, \mathrm{b}$$ and $$\mathrm{c}$$ are found to be, respectively -

A
3, 8, 1
B
1, 8, 3
C
8, 1, 3
D
1, 3, 8
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