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?
The reaction occurs at the cathode during the process of electrolysis.
This is a reduction reaction because it involves the gain of electrons.
OR
One use of aluminium: It is used in making utensils, foils, and lightweight vehicle parts.
Aluminium reacts with acids present in food (like citric acid, acetic acid, etc.), forming aluminium salts, some of which are toxic and can contaminate the food.
More WBBSE Moderate level questions
Mention two classes of electrolytes. How can they be differentiated?
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?
In the extraction of aluminium by the process of electrolysis, the fused mixture used contains which of the following along with cryolite and fluorspar? anhydrous aluminium chloride aluminium hydroxide aluminium sulfate pure alumina
Why is dehydrated calcium chloride added during the extraction of sodium through electrolysis of sodium chloride ? OR Mention two ways of preventing the rusting of iron.
Why does a copper vessel turn green in open air?
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
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]
Fill up the blank : During electrolysis, electricity is carried through the electrolyte by ____
Match the Right column with the Left column: [1 × 4] Left column Right column 2.11.1. An alkaline earth metal (a) Fe 2.11.2. The metal which is present in the highest percentage amount in the alloy invar (b) Zn 2.11.3. An alkali metal (c) Ca 2.11.4. The metal which is given as coating to prevent the rusting of iron (d) K
Which of the following is the formula of zine blende, an ore of zinc? ZnO Zns ZnCO3 InSO4
Why fused sodium chloride can conduct electricity?
What is meant by strong electrolyte? [2] OR What are meant by cathode and anode electrodes? [2]
