MEDIUM

Earn 100

Mercury cell consists of zinc – mercury amalgam as cathode.

50% studentsanswered this correctly

Important Questions on Electrochemistry

MEDIUM

Chemistry>Physical Chemistry>Electrochemistry>Batteries and Fuel Cells

1.3 V

battery has an internal resistance of

0.2 Ω

. What will be the measured voltage across its terminals if a

5 Ω

resistance is connected as a load?

EASY

Chemistry>Physical Chemistry>Electrochemistry>Batteries and Fuel Cells

A cell of emf

1.8

volts gives a current of

17 A

when directly connected to an ammeter of resistance

0.06 Ω

. Internal resistance of the cell is

EASY

Chemistry>Physical Chemistry>Electrochemistry>Batteries and Fuel Cells

The figure shows a part of a closed circuit. If the current flowing through it is $2 A$ then $V_{B} - V_{A}$ is _______

Question Image

EASY

Chemistry>Physical Chemistry>Electrochemistry>Batteries and Fuel Cells

Two sources of equal emfs are connected in series. This combination is connected to an external resistance

R

. The internal resistances of the two sources are

r_{1}

and

r_{2} (r_{1} > r_{2})

. If the potential difference across the source of internal resistance

r_{1}

is zero then the value of

R

will be

MEDIUM

Chemistry>Physical Chemistry>Electrochemistry>Batteries and Fuel Cells

A cell of emf

4 V

and internal resistance

0.2 Ω

is connected with the resistance of

1.8 Ω

. The voltage across the cell terminal will be

MEDIUM

Chemistry>Physical Chemistry>Electrochemistry>Batteries and Fuel Cells

Two identical cells each of emf

1.5 V

are connected in parallel across a parallel combination of two resistors each of resistance

20 Ω

. A voltmeter connected in the circuit measures

1.2 V

. The internal resistance of each cell is :

MEDIUM

Chemistry>Physical Chemistry>Electrochemistry>Batteries and Fuel Cells

Two cells of

emf 6 V

and

3 V

of internal resistances

1 Ω

and

2 Ω

respectively are connected in parallel with their positive terminals together and similarly the negative terminals together. The equivalent

emf

of the combination would be

HARD

Chemistry>Physical Chemistry>Electrochemistry>Batteries and Fuel Cells

The combination of two identical cells, whether connected in series or parallel combination provides the same current through an external resistance of

2 Ω

. The value of internal resistance of each cell is

EASY

Chemistry>Physical Chemistry>Electrochemistry>Batteries and Fuel Cells

In an electrical circuit, a battery is connected to pass

20 C

of charge through it in a certain given time. The potential difference between two plates of the battery is maintained at

15 V

. The workdone by the battery is _______

J

EASY

Chemistry>Physical Chemistry>Electrochemistry>Batteries and Fuel Cells

Two cells of emf $2 E$ and $E$ with internal resistance $r_{1}$ and $r_{2}$ respectively are connected in series to an external resistor $R$ (see figure). The value of $R,$ at which the potential difference across the terminals of the first cell becomes zero is

Question Image

MEDIUM

Chemistry>Physical Chemistry>Electrochemistry>Batteries and Fuel Cells

Two identical cells, when connected either in parallel or in series gives same current in an external resistance

5 Ω

. The internal resistance of each cell will be ______

Ω

MEDIUM

Chemistry>Physical Chemistry>Electrochemistry>Batteries and Fuel Cells

Internal resistance of a cell is independent of

MEDIUM

Chemistry>Physical Chemistry>Electrochemistry>Batteries and Fuel Cells

In an electric circuit, a call of certain emf provides a potential difference of

1.25 V

across a load resistance of

5 Ω .

However, it provides a potential difference of

1 V

across a load resistance of

2 Ω .

The emf of the cell is given by

\frac{x}{10} V .

Then the value of

x

.

MEDIUM

Chemistry>Physical Chemistry>Electrochemistry>Batteries and Fuel Cells

Two cells of internal resistances

r_{1}

and

r_{2}

and of the same emf are connected in series, across a resistor of resistance

R

. If the terminal potential difference across the cells of internal resistance

r_{1}

is zero, then the value of

R

MEDIUM

Chemistry>Physical Chemistry>Electrochemistry>Batteries and Fuel Cells

The variation of terminal potential difference $(V)$ with current flowing through as cell is as shown

Question Image

The $emf$ and internal resistance of the cell are

MEDIUM

Chemistry>Physical Chemistry>Electrochemistry>Batteries and Fuel Cells

Two identical cells connected in series send

1.0 A

current through a

5

Ω

resistor. When they are connected in parallel, they send

0.8 A

current through the same resistor. What is the internal resistance of the cell?

MEDIUM

Chemistry>Physical Chemistry>Electrochemistry>Batteries and Fuel Cells

Two cells with the same emf

E

and different internal resistances

r_{1}

and

r_{2}

are connected in series to an external resistance

R

. The value of

R

so that, the potential difference across the first cell be zero is,

EASY

Chemistry>Physical Chemistry>Electrochemistry>Batteries and Fuel Cells

Three similar cells, each of e.m.f.

2 V

and internal resistance sends the same current through an external resistance of

2

Ω

, when connected in series or parallel. The strength of the current flowing through the external resistance is

MEDIUM

Chemistry>Physical Chemistry>Electrochemistry>Batteries and Fuel Cells

The figure shows a circuit with known resistances

R_{1}

. Neglect the internal resistance of the sources of current and resistance of the connecting wire. The magnitude of electromotive force

E_{1}

such that the resistance

R

is zero will be
Question Image

EASY

Chemistry>Physical Chemistry>Electrochemistry>Batteries and Fuel Cells

A battery of emf

10 V

and internal resistance

3 Ω

is connected to an external resistor. The current in the circuit is

0.5 A .

The terminal voltage of the battery when the circuit is close is

Mercury cell consists of zinc – mercury amalgam as cathode.

Important Questions on Electrochemistry

Learn and Prepare for any exam you want !