Electrochemistry Test

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Electrochemistry Test - 6

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Question 1
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A silver electrode is immersed in a 1.00M solution of AgNO₃. This half-cell is connected to a hydrogen half-cell in which the hydrogen pressure is 1.00 atm and the H⁺ concentration is unknown. The voltage of the cell is 0.78 V. The pH of the acid solution is

A
0.54

B
0.18

C
0.34

D
5.34

Solution

Pt(s)|H₂(g, 1 atm)|H⁺(x M) || Ag⁺(1.00M)|Ag(s)
E_cell = E^o_cell – (0.0592/n)log Q
E^o_cell= E^o(Ag⁺/Ag) - E^o(H₂/H⁺)E^o_cell
= +0.800V – (0) = +0.800V
Overall: 2Ag⁺ + H₂(g, 1 atm) → 2Ag(s) + 2H⁺
n = 2
E_cell = E^o_cell – (0.059/n)log [H⁺]²/[Ag⁺]²
0.78V = 0.800V – (0.059/2)log [x]²/[1.00M]²- 0.020
= –(0.059/2) log [H+]²- 0.020
= –(0.059/2) 2log [H⁺] - 0.020
= –(0.059) log [H⁺]0.3389
= log [H⁺]pH = - log[H⁺]
= -0.3389
Question 2
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Which of the following statements is correct about metallic conduction?

A
Metallic conduction is carried out by the movement of ions.

B
It involves a change in the chemical properties of the conductor.

C
It involves the transfer of matter.

D
It decreases with increase in temperature.

Solution

Metallic conduction decreases with increase in temperature and electrolytic conduction increases with increase in temperature.
Question 3
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Directions For Questions

The following question consists of Assertion (A) and Reason (R). Mark the appropriate answer.

...view full instructions

(A): Equivalent conductance of all electrolytes decreases with increasing concentration.
(R): Lesser ions are available per gram equivalent at higher concentration.

A
Both (A) and (R) are correct and (R) is the right explanation of (A).

B
Both (A) and (R) are correct, but (R) is not the right explanation of (A).

C
(A) is correct, but (R) is incorrect.

D
(A) is incorrect, but (R) is correct.

Solution

Equivalent conductance is defined as the conductance of all the ions produced by one gram equivalent of an electrolyte in a given solution. As lesser ions are available per gram equivalent at higher concentration, So, equivalent conductance of all electrolytes decreases with increasing concentration.
Question 4
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When a lead storage cell is charged,

A
sulphuric acid is consumed

B
sulphuric acid is formed

C
lead sulphate is formed

D
lead is consumed

Solution

During discharge of a lead storage cell, H₂SO₄(sulphuric acid) is consumed, lead is consumed, and PbSO₄ (lead sulphate) is formed. During charging, the reverse occurs.
2PbSO₄ (s) + 2H₂O → Pb (s) + PbO₂ (s) + 2H₂SO₄ (l)
Question 5
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Hydrogen-oxygen fuel cells are used in spacecrafts to supply

A
oxygen

B
hydrogen

C
water

D
illumination

Solution

A fuel cell is a device that converts the chemical energy from a fuel into electricity through a chemical reaction of positively charged hydrogen ions with oxygen. Hydrogen ions, electrons and oxygen react to form water.