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]
In the electrolysis of acidulated water, the reaction occurring at the cathode (where reduction takes place) is:
2H+ + 2e−→ H2↑
Acidulated Water is Used
OR
Reactions in Electrolysis of CuSO4 with Cu Electrodes
In the refining of impure copper, the anode used is made of impure copper metal.
More WBBSE Moderate level questions
Mention two classes of electrolytes. How can they be differentiated?
What is electroplating? What is the cathode in the electroplating of silver over a copper material? [2+1]
Decide which of the following statements is not correct regarding the conductance of electricity through electrolyte (a) Chemical change occurs (b) Conducts electricity in dissolved or molten state (c) Resistance usually increases with the increase in temperature (d) Electricity is conducted through ions
In the extraction of metal by the process of electrolysis at which electrode does the following reaction occur ? M+ + e− ⇌ M (M = Metal) Is it an oxidation or a reduction reaction? Answer with reason. OR Mention one use of aluminium. Why acidic foods should not be kept in an aluminium container?
In the refining of impure copper metal by the process of electrolysis, the mass of which electrode increases? OR In the electroplating of gold over silver, what is used as electrolyte?
Why fused sodium chloride can conduct electricity?
What is meant by strong electrolyte? [2] OR What are meant by cathode and anode electrodes? [2]
Write whether the following statement is True or False : The electrical conductivity of solid NaCl is greater than the electrical conductivity of fused NaCl.
Match the Right column with the Left column : [1 × 4 = 4] Left Column Right Column 2.11.1 Acetic acid (a) non-conductor of electricity 2.11.2 Glass (b) Weak electrolyte 2.11.3 Most electro-negative element (c) Krypton 2.11.4 One Noble Element (d) Fluorine
During electrolysis (a) oxidation occurs at the cathode and reduction occurs at the anode (b) oxidation occurs at both the electrodes (c) reduction occurs at both the electrodes (d) reduction occurs at the cathode and oxidation occurs at the anode.
Acetic acid is a weak electrolyte because in an aqueous solution acetic acid is (a) non-conductor of electricity (b) completely dissociated (c) partially dissociated (d) not dissociated
The order of oxidising properties of Cl (17), I(53), F(9), Br(35) belonging to group 17 of long periodic table is (a) F < Cl < Br < I (b) Cl > I > F > Br (c) Cl > F > Br > I (d) F > Cl > Br > I
