The electrolyte used for electroplating an article with silver is:
- ASilver nitrate solution
- BSilver cynide solution
- ✓Sodium argentocyanide solution
- DNickel sulphate solution
Answer: C.
View full solution →Question types
Electrolysis question types
128 questions across 6 question groups — pick any mix to generate a Chemistry paper with step-by-step answer keys.
128
Questions
6
Question groups
5
Question types
01
MCQ
11 Q→02[2 Mark Question Answer]
32 Q→03[3 Mark Question Answer]
15 Q→04[1 Mark Question Answer]
42 Q→05Fill in the blanks.
14 Q→06[5 Mark Question Answer]
14 Q→Sample Questions
Electrolysis questions
One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
When fused lead bromide is electrolyzed we observe
- AA silver grey deposit at anode and a reddish brown deposit at cathode
- BA silver grey deposit at cathode and reddish brown deposit at anode
- ✓A silver grey deposit at cathode and reddish brown fumes at anode
- DSilver grey fumes at anode and reddish brown fumes at cathode
Answer: C.
View full solution →Which of these will act as a non$-$electrolyte?
- ✓Liquid carbon tetrachloride
- BAcetic acid
- CSodium hydroxide aqueous solution acid
- DPotassium chloride aqueous solution
Answer: A.
View full solution →During ionization metals lose electrons, this change can be called $.......$
- ✓Oxidation
- BReduction
- CRedox
- DDisplacement
Answer: A.
View full solution →A compound which liberates reddish brown gas around the anode during the electrolysis in its molten state is:______________
- ASodium chloride
- BCopper (II) oxide
- CCopper (II) sulphate
- ✓Lead (II) bromide
Answer: D.
View full solution →State the observation at the anode and at the cathode during the electrolysis of :
Copper sulphate solution using copper electrodes.
Copper sulphate solution using copper electrodes.
State the observation at the anode and at the cathode during the electrolysis of :
Fused lead bromide using graphite electrodes
Fused lead bromide using graphite electrodes
Give reason why:
Although copper is a good conductor of electricity, it is a non-electrolyte.
Although copper is a good conductor of electricity, it is a non-electrolyte.
Give reason why:
In the electroplating of an article with silver, the electrolyte sodium argento-cynide solution is preferred over silver nitrate solution.
In the electroplating of an article with silver, the electrolyte sodium argento-cynide solution is preferred over silver nitrate solution.
Give reason why:
Sodium chloride will conduct electricity only in fused or aqueous solution state.
Sodium chloride will conduct electricity only in fused or aqueous solution state.
Copper sulphate solution is electrolyzed using copper electrodes. Study the diagram given alongside and answer the questions that follows.
(i) Which electrode to your left or right is known as the oxidizing electrode and why?
(ii) Write the equation representing the reaction that occurs
(iii) State two appropriate observations for the above electrolysis reactions.
(i) Which electrode to your left or right is known as the oxidizing electrode and why?
(ii) Write the equation representing the reaction that occurs
(iii) State two appropriate observations for the above electrolysis reactions.
Differentiate between electrical conductivity of copper sulphate solution and copper metal.
Three different electrolytic cells, A,B, and C are conncted in separate circuits. Electrolytic cell A contains sodium chloride solution. When the circuit is completed a bulb in the circuit glows brightly. Electrolytic cell B contains acetic acid solution and in this case the bulb in the circuit glows dimly. The electrolytic cell C contains sugar solution and the bulb does not glow. Give a reason for each of these observations.
During the electrolysis of copper (II) sulphate solution using platinum as cathode and carbon an anode:
(i) What do you observe at the cathode and at the anode?
(ii) What change is noticed in the electrolyte?
(iii) Write the reactions at the cathode and at the anode.
(i) What do you observe at the cathode and at the anode?
(ii) What change is noticed in the electrolyte?
(iii) Write the reactions at the cathode and at the anode.
The following is a sketch of an electrolytic cell used in the extraction of aluminium :
(a) What is the substance of which the electrode A and B are made?
(b) At which electrode (A or B) is aluminium formed?
(c) What are the two aluminium compounds in the electrolyte C?
(d) Why is it necessary for electrode B to be co ntinuously replaced?
(a) What is the substance of which the electrode A and B are made?
(b) At which electrode (A or B) is aluminium formed?
(c) What are the two aluminium compounds in the electrolyte C?
(d) Why is it necessary for electrode B to be co ntinuously replaced?
Select the ion, that would get selectively discharge from the aqueous mixture of the ions listed below :
$Pb^{2+}, Ag^+, Cu^+$
View full solution →$Pb^{2+}, Ag^+, Cu^+$
Select the ion, that would get selectively discharge from the aqueous mixture of the ions listec below :
$SO _4^{2-}, NO _3^{-}, OH ^{-}$
View full solution →$SO _4^{2-}, NO _3^{-}, OH ^{-}$
Identify the substance underlined in each of the following case :
The particles present in a liquid such as kerosene, that is non-electrolyte.
The particles present in a liquid such as kerosene, that is non-electrolyte.
Identify the substance underlined in each of the following case :
he electrolyte used for electroplating an article with silver.
he electrolyte used for electroplating an article with silver.
Name the metallic ions that should be present in the electrolyte when an article made copper is to be electroplated with silver
A molecule of _____ contains a triple bond. (hydrogen, nitrogen)
Electro covalent compounds have a _____ boiling point (low, high)
In covalent compounds, the bond is formed due to the __________ of electrons. (Sharing, Transfer)
The _______ the concentration of an ion in a solution, the greater is the probability of its being discharged at its appropriate electrode.
As we descend the electrochemical series containing cations, the tendency of the cations to get ________ at the cathode increases.
Differentiate between the terms strong electrolyte and weak electrolyte (stating any two differences)
M is a metal above hydrogen in the activity series and its oxide has the formula $M_2O$. The oxide when dissolved in water forms the corresponding hydroxide which is a good conductor of electricity. In the above context answer the following:
(i) What kind of combination exists between $M$ and $O$?
(ii) How many electrons and there in the outermost shell of $M$?
(iii) Name the group to which M belongs
(iv) State the reaction taking place in the cathode
(v) Name the product at the anode
View full solution →(i) What kind of combination exists between $M$ and $O$?
(ii) How many electrons and there in the outermost shell of $M$?
(iii) Name the group to which M belongs
(iv) State the reaction taking place in the cathode
(v) Name the product at the anode
Mr Ramu wants electrolyte his key chain with nickel to prevent rusting. For this electroplating
(i) Name the electrolyte
(ii) Name the cathode
(iii) Name the anode
(iv) Give the reaction at the cathode
(v) Give the reaction at the anode
(i) Name the electrolyte
(ii) Name the cathode
(iii) Name the anode
(iv) Give the reaction at the cathode
(v) Give the reaction at the anode
A metal article is to be electroplated with silver. The electrolyte selected is sodium argentocyanide.
(a) What kind of salt is sodium argento cyanide?
(b) Why is it preferred to silver nitrate as an electrolyte?
(c) State one condition to ensure that the deposit is smooth, firm and long lasting.
(d) Write the reaction taking place at the cathode.
(e) Write the reaction taking place at the anode.
(a) What kind of salt is sodium argento cyanide?
(b) Why is it preferred to silver nitrate as an electrolyte?
(c) State one condition to ensure that the deposit is smooth, firm and long lasting.
(d) Write the reaction taking place at the cathode.
(e) Write the reaction taking place at the anode.
The following is an extract from metals in the service of man, Alexander and street /Pelican $1976$: Alumina (aluminium oxide) has a very high melting point over $2000^oC$ so that I cannot readily be liquefied. However, conversion of alumina to aluminium and oxygen, by electrolysis, an occur when it is dissolved in some other substance.
(a) Which solution is used to react with bauxite as first step in obtaining pure aluminium oxide?
(b) The aluminium oxide for the electrolytic extraction of aluminium is obtained by heating aluminium hydroxide. Write the equation for this reaction.
(c) Name the element which serves both as the anode and the cathode in the extraction of aluminium.
(d) Write the equation for the reaction that occurs at the cathode during the extraction of aluminium.
(e) Write the equation for the reaction that occurs at the cathode during extraction of aluminium by electrolysis.
(f) Give the equation for the reaction that occurs at the anode when aluminium is purified by electrolysis.
View full solution →(a) Which solution is used to react with bauxite as first step in obtaining pure aluminium oxide?
(b) The aluminium oxide for the electrolytic extraction of aluminium is obtained by heating aluminium hydroxide. Write the equation for this reaction.
(c) Name the element which serves both as the anode and the cathode in the extraction of aluminium.
(d) Write the equation for the reaction that occurs at the cathode during the extraction of aluminium.
(e) Write the equation for the reaction that occurs at the cathode during extraction of aluminium by electrolysis.
(f) Give the equation for the reaction that occurs at the anode when aluminium is purified by electrolysis.
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