Redox Reactions Test

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Redox Reactions Test - 8

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Weekly Quiz Competition

Question 1
1 / -0

Standard electrode potential for Sn₄⁺/Sn₂⁺ couple is +0.15 V and that for the Cr³⁺ / Cr couple is –0.74 V. These two couples in their standard state are connected to make a cell. The cell potential will be

A
+0.89 V

B
+1.19 V

C
+0.18 V

D
+1.83 V

Solution

E_cell= E_cathod - E_anode

Anodic half cell will be Cr³⁺/Cr.

Cathodic half cell will be Sn⁴⁺/ Sn²⁺.

So, E_cell= 0.15+0.74 = +0.89 V
Question 2
1 / -0

Standard electrode potential of three metals X, Y and Z are –1.2 V, +0.5 V and –3.0 V respectively. The reducing power of these metals will be

A
Z > X > Y

B
X > Y > Z

C
Y > Z > X

D
Y > X > Z

Solution

E⁰_x= –1.2 V; E⁰_y=+0.5 V; E⁰_z= -3.0 V

Because higher the reduction potential, lesser the reducing power.

Therefore, Z > X > Y
Question 3
1 / -0

The oxidation state of iron in K₄[Fe (CN )₆] is

A
4

B
1

C
3

D
+2

Solution

K₄[Fe(CN)₆]

4(+1) + x + 6(-1) = 0

Hence x = +2
Question 4
1 / -0

A metal in a compound can be displaced by another metal in the uncombined state. Which metal is a better reducing agent in such a case?

A
better reducing agent is the one that loses more electrons

B
the reduced metal is a better reducing agent than the reducing metal

C
Both are same in reducing capacity

D
better reducing agent is the one that loses less electrons

Solution

The metal causing displacement is a better reducing agent than the one that is being replaced. In simple words such a metal shows more capability to loose electrons as comparaed to the one that is reduced.
Question 5
1 / -0

Hydrogen is prepared from H₂O by adding

A
AI, which acts as oxidising agent

B
Au, which acts as oxidising agent

C
Ag, which acts as reducing agent

D
Ca, which acts as reducing agent

Solution

Calcium is a silvery-white metal; it is relatively soft, but much harder than sodium metal. Calcium is a member of the alkaline-earth metals (Group II on the periodic table); these metals react vigorously with water, although not as violently as the Group I metals such as sodium or potassium:

Ca(s) + 2H₂O(l) ——> Ca(OH)₂(aq) + H₂(g)
Question 6
1 / -0

In the conversion of Br₂ to Bro^3- , the oxidation number of Br changes from

A
+1 to +5

B
zero to +5

C
+2 to +5

D
zero to -3

Solution

In Br₂oxidation number of Br is 0 while in BrO₃^-Br has oxidation number of +5 as each O carries -2 charge and net charge is -1.
Question 7
1 / -0

In the reaction 2H₂O₂→ 2H₂O + O₂

A
Oxygen is oxidised only

B
Oxygen is reduced only

C
Oxygen is oxidised as well as reduced

D
Oxygen is neither oxidised nor reduced

Solution

This is a dispropotionation reaction.(Disproportionation is a specific type of redox reaction in which an element from a reaction undergoes both oxidation and reduction to form two different products)

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Re-Attempt Weekly Quiz Competition

Redox Reactions Test - 8

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Redox Reactions Test - 8

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SHARING IS CARING

Question 1

+0.89 V

+1.19 V

+0.18 V

+1.83 V

Solution

Question 2

Z > X > Y

X > Y > Z

Y > Z > X

Y > X > Z

Solution

Question 3

4

1

3

+2

Solution

Question 4

better reducing agent is the one that loses more electrons

the reduced metal is a better reducing agent than the reducing metal

Both are same in reducing capacity

better reducing agent is the one that loses less electrons

Solution

Question 5

AI, which acts as oxidising agent

Au, which acts as oxidising agent

Ag, which acts as reducing agent

Ca, which acts as reducing agent

Solution

Question 6

+1 to +5

zero to +5

+2 to +5

zero to -3

Solution

Question 7

Oxygen is oxidised only

Oxygen is reduced only

Oxygen is oxidised as well as reduced

Oxygen is neither oxidised nor reduced

Solution

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