Some materials are given below: Write the chemical equation fo the reaction taking place at the cathode.

The electrode at which the reduction takes place is called the cathode. In Mg electrode: Mg → Mg 2 + + 2 e - In Cu electrode : Cu 2 + + 2 e - → Cu

Some materials are given below: Which is the anode of this cell?

Magnesium rod is the anode of this cell. In the reactivity series of metals Mg is placed on the top and Cu at the bottom of the series. Hence, magnesium is more reactive than copper. Hence, magnesium has the ability to donate electrons readily. The reaction taking place at the anode is given below. Mg → Mg 2 + + 2 e - The electrode at which oxidation occurs is called the anode.

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The additional voltage needed to carry out an electrochemical reaction at a certain rate is called overvoltage.

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Important Questions on Electrochemistry

HARD

Chemistry>Physical Chemistry>Electrochemistry>Electrolytic cells

How long (approximate) should water be electrolysed by passing through

100

amperes

current so that the oxygen released can completely burn

27.66 g

of diborane? (Atomic weight of

B = 10.8 u

)

MEDIUM

Chemistry>Physical Chemistry>Electrochemistry>Electrolytic cells

When 9.65 ampere current was passed for 1.0 hour into nitrobenzene in acidic medium, the amount of p-aminophenol produced is:

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Chemistry>Physical Chemistry>Electrochemistry>Electrolytic cells

A current of $10.0 A$ flows for $2.00 h$ through an electrolytic cell containing a molten salt of metal $X$ . This results in the decomposition of $0.250 mol$ of metal $X$ at the cathode. The oxidation state of $X$ in the molten salt is:

$(F = 96, 500 C)$

EASY

Chemistry>Physical Chemistry>Electrochemistry>Electrolytic cells

A solution of

N i {(N O_{3})}_{2}

is electrolyzed between platinum electrode

0.1

Faraday electricity. How many mole of

N i

will be deposited at the cathode?

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Chemistry>Physical Chemistry>Electrochemistry>Electrolytic cells

Some materials are given below:

Question Image

Write the chemical equation fo the reaction taking place at the cathode.

HARD

Chemistry>Physical Chemistry>Electrochemistry>Electrolytic cells

108 g

of silver (molar mass

108 g {m o l}^{- 1}

) is deposited at cathode from

{A g N O}_{3} (a q)

solution by a certain quantity of electricity. The volume (in

L

) of oxygen gas produced at

273 K

and

1

bar pressure from water by the same quantity of electricity is

\frac{x}{10}

. Value of

' x'

to the nearest integer is _____.

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Chemistry>Physical Chemistry>Electrochemistry>Electrolytic cells

A solution of

N i {(N O_{3})}_{2}

is electrolyzed between platinum electrodes using a current of

5

amperes for

20

minutes. What mass of

N i

is deposited at the cathode?

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Chemistry>Physical Chemistry>Electrochemistry>Electrolytic cells

One litre solution of

{MgCl}_{2}

is electrolyzed completely by passing a current of

1 A

for

16 \min 5

sec. The original concentration of

{MgCl}_{2}

solution was (Atomic mass of

Mg = 24

)

EASY

Chemistry>Physical Chemistry>Electrochemistry>Electrolytic cells

Two Faraday of electricity is passed through a solution of

C u S O_{4}

. The mass of copper deposited at the cathode is: (Atomic mass of Cu = 63.5 amu)

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Chemistry>Physical Chemistry>Electrochemistry>Electrolytic cells

During the electrolysis of molten sodium chloride, the time required to produce

0.10 mol

of chlorine gas using a current of

3 amperes

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Chemistry>Physical Chemistry>Electrochemistry>Electrolytic cells

The weight of silver (at.wt.

= 108

) displaced by a quantity of electricity which displaces

5600 m L

O_{2}

STP

will be

EASY

Chemistry>Physical Chemistry>Electrochemistry>Electrolytic cells

In the electrode of the first kind

{Cl}_{2} / {Cl}^{-}

, the electrode material

{Cl}_{2}

is a non-conductor. How can the electron transfer be carried out with the ion

({Cl}^{-})

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Chemistry>Physical Chemistry>Electrochemistry>Electrolytic cells

When

0.1 m o l {M n O}_{4}^{2 -}

is oxidized the quantity of electricity required to completely

M n O_{4}^{2 -}

M n O_{4}^{-}

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Chemistry>Physical Chemistry>Electrochemistry>Electrolytic cells

Oxidation of succinate ion produces ethylene and carbon dioxide gases. On passing

0.2

Faraday electricity through an aqueous solution of potassium succinate, what is the total volume of gases (at both cathode and anode) at STP (

1 atm

and

273 K

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An aqueous solution of

{CuSO}_{4}

is subjected to electrolysis using inert electrodes. The

pH

of the solution will

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Chemistry>Physical Chemistry>Electrochemistry>Electrolytic cells

0.5 F

of electricity is passed through

500 mL

of copper sulphate solution. The amount of copper which can be deposited will be

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Chemistry>Physical Chemistry>Electrochemistry>Electrolytic cells

The number of Faradays(F) required to produce

20 g

of calcium from molten

{CaCl}_{2}

(Atomic mass of

Ca = 40 g {mol}^{- 1}

) is

EASY

Chemistry>Physical Chemistry>Electrochemistry>Electrolytic cells

The number of electrons delivered at the cathode, during electrolysis by a current of

1 ampere in 60 seconds

is (charge on electron

= 1.60 \times 10^{- 19} C

)

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Chemistry>Physical Chemistry>Electrochemistry>Electrolytic cells

Some materials are given below:

Question Image

Which is the anode of this cell?

HARD

Chemistry>Physical Chemistry>Electrochemistry>Electrolytic cells

What are galvanic cells? Explain the working of a galvanic cell with a neat sketch taking Daniel cell as example.

The additional voltage needed to carry out an electrochemical reaction at a certain rate is called overvoltage.

Important Questions on Electrochemistry

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