Stoichiometry and Redox Reactions Test

Result

Stoichiometry and Redox Reactions Test - 2

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Weekly Quiz Competition

Question 1
1 / -0

Chromium has the highest oxidation state in

A
Cr₂O₃

B
CrF₃

C
CrO₃

D
CrF₅

Solution

Oxidation state of chromium in CrO₃ is +6.

Oxidation state of chromium in CrF₃ is +3.

Oxidation state of chromium in Cr₂O₃is +3.

Oxidation state of chromium in CrF₅ is +5.

Oxidation state of chromium in CrCl₄is +4.

Hence, chromium has the highest oxidation state in CrO_3.
Question 2
1 / -0

For the reaction between KMnO₄ and H₂O₂, the number of electrons transferred per mole of H₂O₂ is

A
1

B
3

C
2

D
4

Solution

KMnO₄ is a stronger oxidising agent than H₂O₂ in the acidic, basic as well as neutral mediums.
In the neutral medium,

2KMnO₄+ 3H₂O₂ ^→ 2MnO₂ + 2KOH + 2H₂O + 3O₂

The overall equation involves a transfer of 6 electrons.

Therefore, the number of electrons transferred per mole of H₂O₂ is 2 and the number of electrons transferred per mole of KMnO₄ is 3.
Question 3
1 / -0

In standardisation of Na₂S₂O₃, using K₂Cr₂O₇ by iodometry, the equivalent weight of K₂Cr₂O₇ is

A
(molecular weight)/6

B
(molecular weight)/2

C
the same as molecular weight

D
(molecular weight)/3

Solution

Cr₂O₇^2- + 14H⁺ + 6e^-→ 2Cr³⁺ + 7H₂O

Eq. wt. of K₂Cr₂O₇ = 1/6 × (molecular weight)