ECAT Chemistry Chapter 10 Electrochemistry

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

Metallic conduction is due to the

• Movement of electrons A
• Movement of ions B
• Both a and b C
• None of these 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

A standard hydrogen electrode (S.H.E) consists of a platinized platinum electrode dipped in 1 molar solution of H⁺ions and hydrogen gas is passed at a pressure of

• One pascal A
• One kilo pascal B
• One atmoshpere C
• Then atmoshpere D

Prevention of corrosion of iron by Zn coating is called

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

When aqueous NaCl is electrolyzed, which of the following ions get discharged at anode :

• H⁺

  A

• Na⁺

  B

• OH^-

  C

• Cl^-

  D

A half reaction can be defines as :

• It always occurs at cathode. A
• Involves only half of a mole of electrolyte. B
• Occurs at one of the electrode. C
• Goes only half way to completion. D

Cell potential depends upon :

• Concentration of ions A
• Nature of electrolyte B
• Temperature C
• All of above D

• Adding H₂O and H⁺ions A
• Adding OH^-ions B
• Adding O²molecules C
• Adding O atoms D

Metallic conduction is also called as :

• Ionic conduction. A
• Protonic conduction. B
• Electronic conduction C
• Super conduction D

Electrochemical series is a list of element S arranged into the increasing order of their

• Standard oxidation potential A
• Standard reduction potential B
• Cell voltage C
• Ionization potential D

When fused PbBr2 is electrolyzed :

• Lead appears at anode. A
• Lead appears at cathode. B
• Bromine appears at cathode. C
• Lead appears at both electrodes. 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

Lead accumulator contains

• 30% NaCI solution as electrolyte A
• 30% HCI solution as electrolyte B
• 30% H₂SO₄solution as electrolyte C
• 30% NaOH solution as electrolyte D

The electrode through which the electrons enter the electrolytic solution is electrolytic solution is

• Anode A
• Cathode B
• May be anode or cathode C
• None of these D

During electrolysis, electrons are :

• Lost by anions and gained by cations A
• Gained by anions and lost by cations B
• Gained only C
• Lost only D

Standard reduction of Zn = -0.76 V and that of Ni is -0.25 V. On coupling them by a salt bridge which of these will act as anode

• Salt bridge will act as anode A
• Zn will act as anode B
• Ni will act as anode C
• None of these D

During electrolysis, the reaction that takes place at cathode is :

• Reduction A
• Both (a) and (c) B
• Oxidation C
• No reaction occurs D

Which one of the following reaction takes place spontaneously

• 
  A
• 
  B
• 
  C
• 
  D

Which of the following is a strong electrolyte?

• Ca(NO₃)₂ A
• HCN B
• CH₃COOH C
• NH₄OH D

Same amount of electric current is passed through solutions of AgNO₃and HCl. If 1.08 g of silver is obtained in the first case, the amount of hydrogen liberated as S.T.P in the second case is

• 112 cm³ A
• 22400 cm³ B
• 224 cm³ C
• 1.008 g D

Metals like Fe, Mg, Al, Cr, Zn have more negative reduction potentials that is whey

• These don't react with steam A
• These react very slowly with steam to liberate H₂gas B
• These react rapidly with steam to produce the metallic oxides and liberate H₂gas C
• These react with cold water violently 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

• Cu A
• H B
• N C
• O D

Which of the following (1 M) conducts more electricity?

• Sulphuric acid A
• Boric acid B
• Nitric acid C
• Phosphorus acid D

Time required to deposit one millimole of aluminium metal by the passage of 9.65 amperes through molten electrolyte containing aluminium ion is

• 30 s A
• 10 s B
• 30,000 s C
• 10,000 s D

Which statement is incorrect about standard hydrogen electrode

• Its oxidation and reduction potential is zero A
• It consists of Pt wire dipped on 1 molar HCI solution B
• The electrolyte is 1 molar NaOH solution C
• H₂gas is passes in it at 1 atmospheric pressure D

The number of coulombs required for the deposition of 107.870 g of silver is

• 96500 A
• 48250 B
• 193000 C
• 10000 D

In an electrolytic cell, the electrons flow from :

• Cathode to anode or opposite A
• Cathode to anode B
• Anode to cathode C
• Random flow D

If the salt bridge is not used between two half cells, then the voltage

• Decrease rapidly A
• Decrease slowly B
• Does not change C
• Drops to zero D