Electrochemistry Test

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Electrochemistry Test - 12

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Weekly Quiz Competition

Question 1
4 / -1

A
6.26 × 10^-7

B
5.33 × 10^-4

C
6.26 × 10⁷

D
5.33 × 10⁴
Question 2
4 / -1

A
1.68 V

B
1.40 V

C
0.91 V

D
0.63 V
Question 3
4 / -1

If the H⁺ concentration decreased from 1 M to 10^-4 M at 25^oC for the couple MnO^-₄/ Mn²⁺, then the oxidisting power of the MnO^-₄/ Mn²⁺ couple decreases by

A
-0.18 V

B
0.18 v

C
0.38 V

D
-0.38 V

Solution
Question 4
4 / -1

Reduction potentials of A, B ,C and D are 0.8 V, 0.79 V, 0.34 V and - 2.37 V respectively. Which element displaces all the other three elements?

A
B

B
A

C
D

D
C
Question 5
4 / -1

Calculate the equilibrium constant for the reaction, at 25^oC
Cu(s) + 2Ag⁺ (aq) → Cu²⁺ (aq) + 2Ag (s)
at 25^oC, E^o_cell = 0.47 V, R = 8.134 JK^-1 F = 96500 C is

A
1.8 × 10¹⁵

B
8.5 × 10¹⁵

C
1.8 × 10¹⁰

D
85 × 10¹⁵

Solution
Question 6
4 / -1

When Cu reacts with AgNO₃ solution, the reaction takes place is

A
oxidation of Cu

B
reduction of Cu

C
oxidation of Ag

D
reduction of NO₃
Question 7
4 / -1

Which will reduce zinc oxide to zinc?

A
Mg

B
Pb

C
Cu

D
Fe
Question 8
4 / -1

The metal that does not displace hydrogen from an acid is

A
Ca

B
Al

C
Zn

D
Hg
Question 9
4 / -1

Which of the following ions can be replaced by H⁺ ions when H₂ gas is bubbled through the solutions containing these ions?

A
Li⁺

B
Ba²⁺

C
Cu²⁺

D
Be²⁺
Question 10
4 / -1

H₂ cannot be displaced by

A
Li⁺

B
Sr²⁺

C
Al³⁺

D
Ag⁺

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Electrochemistry Test - 12

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Electrochemistry Test - 12

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Question 1

6.26 × 10-7

5.33 × 10-4

6.26 × 107

5.33 × 104

Question 2

1.68 V

1.40 V

0.91 V

0.63 V

Question 3

-0.18 V

0.18 v

0.38 V

-0.38 V

Solution

Question 4

B

A

D

C

Question 5

1.8 × 1015

8.5 × 1015

1.8 × 1010

85 × 1015

Solution

Question 6

oxidation of Cu

reduction of Cu

oxidation of Ag

reduction of NO3

Question 7

Mg

Pb

Cu

Fe

Question 8

Ca

Al

Zn

Hg

Question 9

Li+

Ba2+

Cu2+

Be2+

Question 10

Li+

Sr2+

Al3+

Ag+

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6.26 × 10^-7

5.33 × 10^-4

6.26 × 10⁷

5.33 × 10⁴

1.8 × 10¹⁵

8.5 × 10¹⁵

1.8 × 10¹⁰

85 × 10¹⁵

reduction of NO₃

Li⁺

Ba²⁺

Cu²⁺

Be²⁺

Li⁺

Sr²⁺

Al³⁺

Ag⁺