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CBSE

Subject

Chemistry

NEET Chemistry : Redox Reactions

Multiple Choice Questions

31.

During the decomposition of H₂O₂ to give oxygen, 48 g O₂ is formed per minute at a certain point of time. The rate of formation of water at this point is

0.75 mol min^-1
1.5 mol min^-1
2.25 mol min^-1
3.0 mol min^-1

32.

Oxidation state of iron in haemoglobin is

0
+2
-2
+3

33.

Consider the reaction ,

Fe²⁺ $⇌$ Fe³⁺ + e^-

the reaction towards the left is a reduction
the reduction towards the right is a reduction
the reaction towards the right is an oxidation
the reaction towards the right is an oxidation and the reaction towards the left is an reduction

34.

When SO₂ gas is passed through an acidified K₂Cr₂O₇ solution :

the solution becomes blue
SO₂ gets reduced
Cr(SO₄)₃ is formed
the solution becomes colourless

35.

Which of the following is not a redox reaction ?

KCN + Fe(CN)₂ $\to$ K₄[Fe(CN)₆]
Rb + H₂O $\to$ RbOH + H₂
H₂O₂ $\to$ H₂O + O
CuI₂ $\to$ CuI + I₂

36.

Assertion : Cu is stronger reducing agent than H₂.

Reason : E° of Cu²⁺/Cu is negative.

If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.

37.

Which of the following statement is not true for hydrolysis of XeF₆?

XeOF₄ is formed.
XeO₂F₂ is formed.
It is a redox reaction.
XeO₃ is formed

38.

MnO₃in an acidic medium dissociates into

${MnO}_{2} and {MnO}_{4}^{-}$
$MnO and {MnO}_{4}^{-}$
${MnO}_{2} and MnO$
${MnO}_{2} and {MnO}_{3}$

39.

Which of the following ion does not exist?

[CuI₄]^2-
VO $_{4}^{3 -}$
WO $_{4}^{2 -}$
CrO $_{4}^{2 -}$

40.

In the following reaction ,

P₄ + 3NaOH + 3H₂O $\to$ PH₃ + 3NaH₂PO₂

phosphorus is oxidised
phosphorus is oxidised and reduced
phosphorus is reduced
sodium is oxidised

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