ECAT Pre Engineering Chemistry Chapter 10 MCQ Test With Answer for Chemistry chapter 10 (Electrochemistry)

A cell constant is generally found by measuring the conductivity of aqueous solution of

• BaCl₂ A
• KCl B
• NaCl C
• MgCl₂ D

A cell in which spontaneous redox reaction generates an electric current is called

• Electrolytic cell A
• Electrochemical cell B
• Voltaic or Galvanic cell C
• Biological cell D

Caustic soda is obtained by electrolysis of conc. aqueous solution of NaCI in a cell called

• Daniell's cell A
• Nelson's cell B
• Down's cell C
• Voltaic cell D

96500 C of electricity liberates from CuSO₄solution

• 63.5 g of Cu A
• 31.75 g of Cu B
• 96500 g of Cu C
• 100 g of Cu D

In electrolysis of NaCl when Pt electrode is taken then H₂is liberated at cathode while with Hg cathode it forms sodium amalgam

• Hg is more inert than Pt A
• More voltage is required to deduce H⁺at Hg than Pt B
• Na is dissolved in Hg while it does not dissolve in Pt C
• Conc. of H⁺ions is larger when Pt electrode is taken D

Strong reducing agents gave

• Greater positive value of standard reduction potential A
• Greater negative value of standard reduction potential B
• Lesser positive value of standard reaction potential C
• None of these D

Sodium can be obtained by :

• Electrolysis of acidified water. A
• By heating NaCl and water at 100°
  B
• Electrolysis of molten sodium chloride. C
• Electrolysis of aqueous sodium chloride. D

96500 C electricity is passed through CuSO₄. The amount of copper precipitated is

• 0.25 mole A
• 0.5 mole B
• 1.0 mole C
• 2.00 mole D

The oxidation number of Mn is KMnO₄is

• +2 A
• +4 B
• +6 C
• +7 D

Which statement is incorrect for balancing of redox reactions by ion-electron method

• The reaction is splitted into two half reactions A
• H₂O and H⁺ions are added for acidic or neutral reaction to balance O and H atoms B
• To balance H, HCi, is added C
• To balance O and H in the alkaline reaction OH^-added D

Alkaline battery has a voltage of

• 4.5 V A
• 3.5 V B
• 2.5 V C
• 1.5 V D

The oxidation state of an element is zero when

• It forms an oxide A
• It forms hydride B
• It is in free state C
• Only for noble gases D

An electrolyte

• Forms complex ions solution A
• Gives ions only when electricity is passed B
• Possesses ions even in solid state C
• Gives ions only when dissolved in water D

The amount of electricity that can deposit 108 g of silver from silver nitrate solution is

• 1 ampere A
• 1 coulomb B
• 1 faraday C
• 2 ampere D

Sodium metal is obtained by the electrolysis of fused NaCl in cell is called

• Nelson's cell A
• Down's cell B
• Daniell cell C
• Voltaic cell D

In the presence of copper electrodes the electrolysis of aqueous CuSO₄produces at cathode

• H₂gas A
• O₂gas B
• SO₂gas C
• Cu metal D

What are the products electrolysis of aqueous sodium chloride at two electrodes

• Chlorine at anode and oxygen at cathode. A
• Hydrogen at anode and chlorine at cathode. B
• Chlorine at anode and hydrogen at cathode. C
• Chlorine at anode and sodium at cathode. D

When during electrolysis of a solution of AgNO₃, 9650 coulombs of charge pass through the electroplating bath, the mass of silver deposited on the cathode will be

• 1.08 g A
• 10.8 g B
• 21.6 g C
• 108 g D

By using graphite electrode the electrolysis of aqueous solution of NaCI produces at anode

• H₂gas A
• Cl₂gas B
• NaOH C
• No metal D

When aluminium electrode is coupled with copper electrode in a galvanic cell :

• Reduction takes place at aluminium electrode. A
• Oxidation takes place at copper electrode. B
• Reduction takes place at copper electrode. C
• Both (a) and (c) D

The two half cells of a galvanic cell are connected by

• Ammeter A
• Salt bridge B
• Hydrogen electrode C
• Copper electrode D

The art of electroplating was given by

• Faraday A
• Edison B
• Thomas Gradam C
• Brugan D

Electrolysis is used for :

• Manufacture of caustic soda A
• Refining of copper B
• Electroplating C
• All of above D

Metals which are above SHE in electrochemical series

• Can liberate H₂from acid A
• Cannot liberate H₂from acid B
• Cannot always liberate H₂from acid C
• None of these D

Strong oxidizing agents have

• Greater positive value of standard reduction potential A
• Lesser positive value of standard B
• Greater negative value of standard C
• None of these D

When electric current is used to carry out non-spontaneous redox, the process is called

• Hydrolysis A
• Electrolysis B
• Decomposition C
• Neutralization D

Prevention of corrosion of iron by Zn coating is called

• Galvanization A
• Cathodic protection B
• Electrolysis C
• Photoelectrolysis D

In passage of electricity through aqueous solution of AgNO₃silver dissolves at anode to form Ag⁺, the electrodes are

• Silver metal A
• Pt metal B
• Graphite C
• Copper metal D

• Iodine can oxidise iron A
• Bromine can oxidise iron B
• Iodine can oxidise bromine C
• Iron can oxidise bromine D

The cell in which a non-spontaneous redox reaction takes place as a result electricity is known as :

• Electrolytic cell. A
• Voltaic cell. B
• Daniel cell. C
• Dry cell. D