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CBSE

Subject

Chemistry

NEET Chemistry : Redox Reactions

Multiple Choice Questions

When KMnO₄ acts as an oxidising agent and ultimately forms Mn $O_{4}^{2 -}$ MnO₂, Mn₂O₃ and Mn²⁺ then the number of electrons, transferred in each case respectively are

1, 3, 4, 5
3, 2, 1, 4
1, 5, 3, 7
4, 3, 2, 1

Which of the following statements is incorrect regarding the reaction?

CH₃CHO + [Ag(NH₃)₂]^$\oplus$ + OH^-_$\to$CH₃COO^- + Ag

The equivalent weight of CH₃CHO is 22
Three moles of OH^- are required in the above D reaction
CH₃CHO is an oxidising agent
Reduction of [Ag(NH₃)₂]^$\oplus$ occurs

For the redox reaction

$M n O_{4}^{-} + C_{2} O_{4}^{- 2} + H^{+} \overset{}{\to} M n^{2 +} + C O_{2} + H_{2} O$

The correct coefficients of the reactants for the balanced equation are

$M n O_{4}^{-}$ $C_{2} O_{4}^{2 -}$ H⁺

16 5 2
MnO₄^- C₂O₄^2- H⁺

2 5 16
MnO₄^- C₂O₄^2- H⁺

5 16 2
MnO₄^- C₂O₄^2- H⁺

2 16 5

when I^- is oxidised by MnO₄^- in an alkaline medium I^- converts into

IO₃^-
I₂
IO₄^-
IO^-

The value of n in

Mn $O_{4}^{-}$ + 8H⁺+ ne^- $\to$ Mn²⁺ + 4H₂O is

For the formation of Cr₂O₃ and Al₂O₃, values of $∆_{f} G °$ are 540 kJ mol^-1 and -827 kJ mol^-1 respectively. What will be the possibility for reaction of Cr₂O₃ by Al?

Reduction of Cr₂O₃ by Al will take place
Oxidation of Cr₂O₃ by Al will take place
Neither oxidation nor reduction will take place
Reaction is not feasible

In which of the following compounds, nitrogen exhibits highest oxidation state?

N₂H₄
NH₃
N₃H
N₃H

When Cl₂ gas reacts with hot and concentrated sodium hydroxide solution, the oxidation number of chlorine changes from

zero to +1 and zero to -5
zero to -1 and zero to +5
zero to -1 and zero to +5
zero to -1 and zero to +5

(I)H₂O₂ +O₃ --> H₂O +2O₂
(II) H₂O₂ +Ag₂O +--> 2Ag +H₂O +O₂
Role of hydrogen peroxide in the above reaction is respectively

oxidising in (I) and reducing (II)
reducing (I) and oxidizing in (II)
reducing in (I) and (II)
reducing in (I) and (II)

10.

A mixture of potassium chlorate, oxalic acid and sulphuric acid is heated. During the reaction which element undergoes a maximum change in the oxidation number?

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$M n O_{4}^{-}$	$C_{2} O_{4}^{2 -}$	H⁺
16	5	2

MnO₄^-	C₂O₄^2-	H⁺
2	5	16

MnO₄^-	C₂O₄^2-	H⁺
5	16	2

MnO₄^-	C₂O₄^2-	H⁺
2	16	5