1
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.
2
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
3
NEET 2022 Phase 2
MCQ (Single Correct Answer)
+4
-1

Which of the following reactions is a decomposition redox reaction?

A
P4(s) + 3OH$$-$$(aq) + 3H2O(l) $$\to$$ PH3(g) + 3H2PO$$_2^ - $$(aq)
B
2Pb(NO3)2(s) $$\to$$ 2PbO(s) + 4NO2(g) + O2(g)
C
N2(g) + O2(g) $$\to$$ 2NO(g)
D
Cl2(g) + 2OH$$-$$(aq) $$\to$$ ClO$$-$$(aq) + Cl$$-$$(aq) + 4H2O(l)
4
NEET 2020 Phase 1
MCQ (Single Correct Answer)
+4
-1
What is the change in oxidation number of carbon in the following reaction?
CH4(g) + 4Cl2(g) $$ \to $$ CCl4(l) + 4HCl(g)
A
0 to + 4
B
$$ - $$4 to + 4
C
0 to $$ - $$ 4
D
+ 4 to + 4
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