Write the reaction occurring at the cathode in the electrolysis of acidulated water using platinum electrodes. Why is acidulated water instead of pure water used for electrolysis? [1+2]
OR
Write the reactions occurring at cathode and anode in the electrolysis of the aqueous solution of CuSO4 using Cu – electrodes. What is used as anode in refining of impure copper metal by the process of electrolysis? [2+1]
WBBSE
Class X
Physical Science
Electrolysis
03 Mark
2022
In the electrolysis of acidulated water, the reaction occurring at the cathode (where reduction takes place) is:
2H+ + 2e−→ H2↑
Acidulated Water is Used
- Increased Conductivity: Acidulated water has more ions, improving conductivity compared to pure water.
- Faster Reaction: The presence of H+ ions accelerates hydrogen gas formation at the cathode, making electrolysis more efficient.
OR
Reactions in Electrolysis of CuSO4 with Cu Electrodes
- At the Cathode: Cu2+ + 2e − → Cu (s)
- At the Anode: Cu (s) → Cu2+ + 2e−
In the refining of impure copper, the anode used is made of impure copper metal.
Related Questions
More WBBSE Moderate level questions
1/12
Q.
Mention two classes of electrolytes. How can they be differentiated?
A.
Two Classes of Electrolytes: Strong Electrolytes: Completely dissociate into ions in solution...
Q.
What is electroplating? What is the cathode in the electroplating of silver over a copper...
A.
Electroplating is a process that uses electric current to deposit a layer...
Q.
Decide which of the following statements is not correct regarding the conductance of electricity through...
A.
(c) Resistance usually increases with the increase in temperature Explanation This statement...
Q.
In the extraction of metal by the process of electrolysis at which electrode does the...
A.
The reaction occurs at the cathode during the process of electrolysis. This...
Q.
In the refining of impure copper metal by the process of electrolysis, the mass of...
A.
In the refining of impure copper metal by the process of electrolysis,...
Q.
Why fused sodium chloride can conduct electricity?
A.
Fused sodium chloride can conduct electricity because, when it is melted (fused),...
Q.
What is meant by strong electrolyte?
A.
Strong Electrolyte A substance that completely dissociates into ions in water and...
Q.
The electrical conductivity of solid NaCl is greater than the electrical conductivity of fused NaCl....
A.
False. The electrical conductivity of fused NaCl is greater than that of...
Q.
Match the Right column with the Left column
A.
2.11.1 Acetic acid → (b) Weak electrolyte 2.11.2 Glass → (a) non-conductor...
Q.
During electrolysis (a) oxidation occurs at the cathode and reduction occurs at the anode (b)...
A.
d. Reduction occurs at the cathode and oxidation occurs at the anode....
Q.
Acetic acid is a weak electrolyte because in an aqueous solution acetic acid is (a)...
A.
(c) Partially dissociated Explanation: Acetic acid (CH₃COOH) is a weak electrolyte because...
Q.
The order of oxidising properties of Cl (17), I(53), F(9), Br(35) belonging to group 17...
A.
(d) F > Cl > Br > I Explanation: In Group 17...