ECAT Pre Engineering Chemistry Chapter 10 MCQ Test With Answer

Top Scorers Of ECAT Chemistry Chapter 10 Electrochemistry MCQ`s Test

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Sr.#	Question	Answer
1	In electronic watches or electronic calculators the tiny batteries used are	A. Alkaline battery B. NICAD battery C. Fuel cell D. Silver oxide battery
2	A cell constant is generally found by measuring the conductivity of aqueous solution of	A. BaCl₂ B. KCl C. NaCl D. MgCl₂
3	Which of the following (1 M) conducts more electricity?	A. Sulphuric acid B. Boric acid C. Nitric acid D. Phosphorus acid
4	Strong oxidizing agents have	A. Greater positive value of standard reduction potential B. Lesser positive value of standard C. Greater negative value of standard D. None of these
5	When fused PbBr2 is electrolyzed :	A. Lead appears at anode. B. Lead appears at cathode. C. Bromine appears at cathode. D. Lead appears at both electrodes.
6	Strong reducing agents gave	A. Greater positive value of standard reduction potential B. Greater negative value of standard reduction potential C. Lesser positive value of standard reaction potential D. None of these
7	Specific conductivity of a solution	A. Increases with dilution B. Decreases with dilution C. Remains unchanged with dilution D. Depends on mass of electrolyte
8	The process of electrical coating of one metal on another to protect, decorate or to have greater resistance to corrosion is called	A. Electroplating B. Electrolysis C. Conduction D. Induction
9		A. Iodine can oxidise iron B. Bromine can oxidise iron C. Iodine can oxidise bromine D. Iron can oxidise bromine
10	A cell in which spontaneous redox reaction generates an electric current is called	A. Electrolytic cell B. Electrochemical cell C. Voltaic or Galvanic cell D. Biological cell
11	In a Galvanic cell	A. Chemical energy is converted into electricity B. Chemical energy is converted into heat C. Electrical energy is converted into heat D. Electrical energy is converted into chemical energy
12	Metallic conduction is also called as :	A. Ionic conduction. B. Protonic conduction. C. Electronic conduction D. Super conduction
13	Corrosion reaction are	A. Spontaneous redox reaction B. Non-spontaneous acid-base reactions C. Spontaneous acid-base reactions D. None of these
14	The oxidation state of an element is zero when	A. It forms an oxide B. It forms hydride C. It is in free state D. Only for noble gases
15	If the salt bridge is not used between two half cells, then the voltage	A. Decrease rapidly B. Decrease slowly C. Does not change D. Drops to zero
16	The oxidation number of free element is always taken to be	A. 0 B. 1 C. 2 D. -1
17	Cell potential depends upon :	A. Concentration of ions B. Nature of electrolyte C. Temperature D. All of above
18	The cathodic reaction in the electrolysis of dill H₂SO₄with Pt electrodes	A. Reduction B. Oxidation C. Both oxidation and reduction D. neither oxidation or reduction
19	96500 C electricity is passed through CuSO₄. The amount of copper precipitated is	A. 0.25 mole B. 0.5 mole C. 1.0 mole D. 2.00 mole
20	For spontaneity of a cell, which is correct?	A. ΔG = 0,ΔE = 0 B. ΔG = -ve ,ΔE = 0 C. ΔG = +ve ,ΔE = 0 D. ΔG = -ve
21	Electrolysis is used for :	A. Manufacture of caustic soda B. Refining of copper C. Electroplating D. All of above
22	When aqueous NaCl is electrolyzed, which of the following ions get discharged at anode :	A. H⁺ B. Na⁺ C. OH^- D. Cl^-
23	Prevention of corrosion of iron by Zn coating is called	A. Galvanization B. Cathodic protection C. Electrolysis D. Photoelectrolysis
24	The best electrode used in salt bridge is KCl. Which other electrolyte an also be used for the purpose :	A. NaCl B. NH₄NO₃ C. KNO₃ D. NaNO₃
25	The reference electrode is made by using	A. ZnCl₂ B. CuSO₄ C. HgCl₂ D. Hg₂Cl₂
26	Purification of an impure copper is made by electrolytic cell, in which impure copper is anode and pure copper is cathode, and the electrolyte used is	A. H₂SO₄ B. CuSO₄ C. ZnSO₄ D. Na₂SO₄
27	Metals which are above SHE in electrochemical series	A. Can liberate H₂from acid B. Cannot liberate H₂from acid C. Cannot always liberate H₂from acid D. None of these
28	A smuggler could not carry gold by chemically depositing iron on the gold surface since	A. Gold is denser B. Iron rusts C. Gold has higher reduction potential then iron D. Gold has lower reduction potential then iron
29	The function of salt bridge is :	A. To increase movement onions. B. To increase the emf of cell. C. To decrease the temperate D. To maintain electrical neutrality
30	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	A. 10 B. 50 C. 30 D. 96.5

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ECAT Pre Engineering Chemistry Chapter 10 MCQ Test With Answer

MCQ's Test For ECAT Chemistry Chapter 10 Electrochemistry

ECAT Chemistry Chapter 10 Electrochemistry

In lead accumulator the electrolyte is H2SO4solution is

Electrolysis is used for :

The specific conductance of a 0.1 N KCl solution at 23°C is 0.012 ohm-1cm-1. The resistance of cell containing the solution at the same temperature was found to be 55 ohm. The cell constant will be

In the reaction K2Cr2O7+ HCl + CrCl3+ Cl2+ H2O the element which is reduced is

When electricity is passed through molten electrolyte consisting of alumina and cryolite, 13.5 g of Al are deposited. The number of faradays of electricity passed must be

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

Purification of an impure copper is made by electrolytic cell, in which impure copper is anode and pure copper is cathode, and the electrolyte used is

An electrolyte

Which of the following statements is true about Galvanic cell

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

Strong oxidizing agents have

In KO2the oxidation state of oxygen is

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

In a compound an atom has negative oxidation state because

Strong reducing agents gave

Which statement is incorrect for NICAD battery

The specific conductance of 0.1 M NaCl solution is 1.06 x 10-2ohm-1mol-1. Its molar conductance in ohm-1cm2mol-1is

When fused PbBr2is electrolyzed

Pick out the wrong statement. In electrochemical cell

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

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

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

The art of electroplating was given by

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

Metallic conduction is due to the

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

An electrochemical cell is based upon

Reduction or oxidation potential of standard hydrogen electrode is :

In a solution of CuSO4how much time will be required to precipitate 2g copper by 0.5 ampere current?

The electrolysis of CuSO4aqueous solution using copper as cathode as well an anode the substance which deposits at cathode is

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In lead accumulator the electrolyte is H₂SO₄solution is

The specific conductance of a 0.1 N KCl solution at 23°C is 0.012 ohm^-1cm^-1. The resistance of cell containing the solution at the same temperature was found to be 55 ohm. The cell constant will be

In the reaction K₂Cr₂O₇+ HCl + CrCl₃+ Cl₂+ H₂O the element which is reduced is

In KO₂the oxidation state of oxygen is

The specific conductance of 0.1 M NaCl solution is 1.06 x 10^-2ohm^-1mol^-1. Its molar conductance in ohm^-1cm²mol^-1is

When fused PbBr₂is electrolyzed

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

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

In a solution of CuSO₄how much time will be required to precipitate 2g copper by 0.5 ampere current?

The electrolysis of CuSO₄aqueous solution using copper as cathode as well an anode the substance which deposits at cathode is