Question # 1

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

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Hg is more inert than Pt

More voltage is required to deduce H⁺at Hg than Pt

Na is dissolved in Hg while it does not dissolve in Pt

Conc. of H⁺ions is larger when Pt electrode is taken

Lead accumulator contains

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30% NaCI solution as electrolyte

30% HCI solution as electrolyte

30% H₂SO₄solution as electrolyte

30% NaOH solution as electrolyte

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

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12157.48 sec

102 sec

510 sec

642 sec

The process of electrical coating of one metal on another to protect, decorate or to have greater resistance to corrosion is called

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Electroplating

Electrolysis

Conduction

Induction

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

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BaCl₂

KCl

NaCl

MgCl₂

During electrolysis, electrons are :

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Lost by anions and gained by cations

Gained by anions and lost by cations

Gained only

Lost only

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

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Silver metal

Pt metal

Graphite

Copper metal

The conversion of chemical energy into electrical energy requires :

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Electrolytic cell

Galvanic cell

Voltaic cell

Both (b) and (c)

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

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0.142 cm^-1

0.66 cm^-1

0.916 cm^-1

1.12 cm^-1

Fe can displace Cu form CuSO4solution because

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Fe is ferromagnetic

Fe is below Cu in electrochemical series

Fe is above Cu in electrochemical series

Fe exists in divalent oxidation state

Sodium can be obtained by :

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Electrolysis of acidified water.

By heating NaCl and water at 100°

Electrolysis of molten sodium chloride.

Electrolysis of aqueous sodium chloride.

In a hydrogen-oxygen fuel cell, combustion of hydrogen occurs to

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Generate heat

Remove adsorbed oxygen from electrode surfaces

Produce High purity water

Create potential difference between two electrodes

An electric current is passed through silver voltameter connected to a water voltmeter. The cathode of the silver voltameter is 0.108 g more at the end of the electrolysis. The volume of oxygen evolved at STP is

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56 cm³

550 cm³

5.6 cm³

11.2 cm³

Out of Cu, Ag, Fe and Zn the metal which can displace all others from theri salt solution is

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Ag

Cu

Zn

Fe

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

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30 s

10 s

30,000 s

10,000 s

When aqueous solution of NaOH is electrolysed useing graphite electrodes, the product obtained at anode is

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O₂gas

H₂gas

Na metal

Na₂O

In electrolytic cells, the chemical changes may be :

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Either spontaneous or non-spontaneous

Always spontaneous

Always non-spontaneous

More spontaneous and less non-spontaneous.

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

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These don't react with steam

These react very slowly with steam to liberate H₂gas

These react rapidly with steam to produce the metallic oxides and liberate H₂gas

These react with cold water violently

When fused PbBr₂is electrolyed then

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Bromine appears at cathode

Lead deposited at the cathode

Lead appears at the anode

None of these happens

Which one of the following reactions is not spontaneous

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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

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2.0

1.5

1.0

0.5

Metallic conduction is also called as :

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Ionic conduction.

Protonic conduction.

Electronic conduction

Super conduction

Reduction or oxidation potential of standard hydrogen electrode is :

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0.0 Volt

0.8Volt

1.0Volt

1.8Volt

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

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1.08 g

10.8 g

21.6 g

108 g

In electronic watches or electronic calculators the tiny batteries used are

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Alkaline battery

NICAD battery

Fuel cell

Silver oxide battery

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

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+1

-1

0.1

Zero

Prevention of corrosion of iron by Zn coating is called

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Galvanization

Cathodic protection

Electrolysis

Photoelectrolysis

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

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Electrolytic cell

Electrochemical cell

Voltaic or Galvanic cell

Biological cell

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

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K

Cl

Cr

H

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A strong reducing agent

A strong oxidising agent

Better oxidising agent than hydrogen

Less reducing agent than hydrogen

The function of salt bridge is :

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To increase movement onions.

To increase the emf of cell.

To decrease the temperate

To maintain electrical neutrality

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