ECAT Pre Engineering Chemistry Chapter 10 MCQ Test With Answer

The reaction is galvanic cell is

• Spontaneous A
• Non-spontaneous B
• Acid-base C
• None of these D

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

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

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

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

The difference of potential of two electrodes when concentration of solution is 1M each at 25°C and1 atm is called :

• Cell reaction. A
• Electrode potential. B
• Cell voltage. C
• Standard cell potential. D

The oxidation number of H is -1 in the compound

• H₂O A
• H₃BO₃ B
• NaOH C
• NaH D

The standard e.m.f. of a galvanic cell involving cell reaction with n = 2 is found to be 0.2965 V at 25°C. The equilibrium constant of the reaction would be

• 1.0 x 10¹⁰ A
• 2.0 x 10¹¹ B
• 4.0 x 10¹² C
• 1.0 x 10² D

A current of 9.65 ampere flowing for 10 minutes deposits 3.0 g of the metal which is monovalent. The atomic mass of the metal is

• 10 A
• 50 B
• 30 C
• 96.5 D

In a Galvanic cell

• Chemical energy is converted into electricity A
• Chemical energy is converted into heat B
• Electrical energy is converted into heat C
• Electrical energy is converted into chemical energy D

Coinage metals like Au, Pt, Ag and Cu are the least reactive metals and don't liberate H₂gas when treated with acids because

• These have very high positive values of reduction potentials A
• These have very high negative values of reduction potentials B
• Their ionization potentials are lowest C
• Their reduction potentials are close to SHE D

When quantity of electricity passed is one faraday then the mass deposited at the electrode is equal to

• One gm, atomic weight A
• One gm, Equivalent B
• Eletrochemical equivalent C
• None of the above 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

Which of the following statement is incorrect about SHE(Standard hydrogen electrode):

• Reduction potential of Cu⁺² is smaller than H⁺ions whenit is coupled with copper electrode. A
• gas is passed in it at 1 atm pressure. B
• Its oxidation potential and reduction potential is zero. C
• It is made of platinum wire dipped in HCl solution D

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

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

Coupling of Pb with its Pb⁺⁺/Pb = -0.13 V and Ag with Ag⁺/ Ag = +0.80 V, the cell reaction

• 
  A
• 
  B
• 
  C
• 
  D

Which statement is incorrect for NICAD battery

• The electrolyte is alkali A
• Cd acts as anode B
• MnO₂acts as electrolyte C
• NiO₂acts as cathode 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

Reaction takes place at anode is

• Ionization A
• Reduction B
• Oxidation C
• Hydrolysis D

For spontaneity of a cell, which is correct?

• ΔG = 0,ΔE = 0 A
• ΔG = -ve ,ΔE = 0 B
• ΔG = +ve ,ΔE = 0 C
• ΔG = -ve 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

Cell in which an electric current drives a non-spontaneous reaction is called

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

Which of the following yield both hydrogen and chlorine on electrolysis:

• Electrolysis of acidified water. A
• Electrolysis of molten NaCl B
• Electrolysis of aqueous NaCl C
• Electrolysis of saline water D

When a metal is dipped in 1 molar of its solution at 298 K. then potential set up is called

• Standard electrode potential A
• Electric charge B
• Ionization potential C
• Electroplating D

What will be the weight of deposited silver on passing 965 coulombs of electricity in solution of AgNO₃?

• 1.08 g A
• 2.16 g B
• 0.54 g C
• 0.27 g D

Corrosion is basically a

• Altered reaction in presence of H₂O A
• Electrochemical phenomenon B
• Interaction C
• Union between two light metals and a heavy metal D

• A strong reducing agent A
• A strong oxidising agent B
• Better oxidising agent than hydrogen C
• Less reducing agent than hydrogen D

An electric current is passed through silver nitrate solution using silver electrodes.10.79 g of silver was found to be deposited on the cathode if the same amount of electricity is passed through copper sulphate solution using copper electrodes, the weight of copper deposited on the cathode is

• 6.4 g A
• 2.3 g B
• 128.8 g C
• 3.2 g D

A standard hydrogen electrode is used as standard electrode of which electrode potential is arbitrarily taken as

• +1 A
• -1 B
• 0.1 C
• Zero D

The voltaic or galvanic cells which cannot be recharged are called

• Primary cells A
• Secondary cells B
• Infinite cells C
• Fuel cells D

When fused PbBr₂is electrolyzed

• Bromine appears at he cathode A
• Lead is deposited at the cathode B
• Lead appears at the anode C
• None of these happens D