Redox and Electrochemistry Test

Result

Redox and Electrochemistry Test - 2

Score
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Rank
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TIME Taken - -

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Weekly Quiz Competition

Question 1
1 / -0

Saturated solution of KNO₃ is used to make 'salt bridge' because -

A
Velocity of K⁺ is greater than that of NO₃^–

B
Velocity of NO₃^– is greater than that of K⁺

C
Velocities of both K⁺ and NO₃^– are nearly the same

D
KNO₃ is highly soluble in water

Solution

Velocity almost same, so conductivity in cathodic and anodic compartments is not effected.
Question 2
1 / -0

Given below are the half–cell reactions :

Mn²⁺ + 2e^– → Mn; E° = –1.18 V

2(Mn³⁺ + e^– →Mn²⁺); E° = +1.51 V

The E ° for 3Mn²⁺ → Mn + 2Mn³⁺ will be

A
–0.33 V

B
+ 0.33 V

C
– 2.69 V

D
+ 2.69 V

Solution

Mn⁺² + 2e^–→ Mn E ° = – 1.18 V

2Mn⁺²⁺→ 2Mn⁺³ + 2e^– E ° = – 1.51 V

3Mn⁺² → Mn + 2Mn⁺³

E ° = Standard Oxidation potential + Standard reduction potential.

= –1.18 + (– 1.51)

= – 2.69 V
Hence, option C is correct.