NEET 2023 | Redox Reactions Question 2 | Chemistry

NEET 2023

MCQ (Single Correct Answer)

-1

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 -

3, 8, 1

1, 8, 3

8, 1, 3

1, 3, 8

NEET 2022 Phase 2

MCQ (Single Correct Answer)

-1

Which of the following reactions is a decomposition redox reaction?

P₄(s) + 3OH^$$-$$(aq) + 3H₂O(l) $$\to$$ PH₃(g) + 3H₂PO$$_2^ - $$(aq)

2Pb(NO₃)₂(s) $$\to$$ 2PbO(s) + 4NO₂(g) + O₂(g)

N₂(g) + O₂(g) $$\to$$ 2NO(g)

Cl₂(g) + 2OH^$$-$$(aq) $$\to$$ ClO^$$-$$(aq) + Cl^$$-$$(aq) + 4H₂O(l)

NEET 2020 Phase 1

MCQ (Single Correct Answer)

-1

What is the change in oxidation number of carbon in the following reaction?
CH₄(g) + 4Cl₂(g) $$ \to $$ CCl₄(l) + 4HCl(g)

0 to + 4

$$ - $$4 to + 4

0 to $$ - $$ 4

+ 4 to + 4

NEET 2019

MCQ (Single Correct Answer)

-1

Which of the following reactions are disproportionation reaction?

(a) 2Cu⁺ $$ \to $$ Cu²⁺ + Cu⁰
(b) 3MnO₄²⁺ + 4H⁺ $$ \to $$ 2MnO₄^- + MnO₂ + 2H₂O
(c) 2KMnO₄ $$\buildrel \Delta \over \longrightarrow $$ K₂MnO₄ + MnO₂ + O₂
(d) 2MnO₄^- + 3Mn²⁺ + 2H₂O $$ \to $$ 5MnO₂ + 4$${H^ \oplus }$$

Select the correct option from the following :

(a), (c) and (d)

(a) and (b) only

(a) and (d) only

(a), (b) and (c)

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