Electrochemistry Test

Question 1
1 / -0

When water is added to an aqueous solution of an electrolyte, what is the change in specific conductivity of the electrolyte?

A
Conductivity decreases

B
Conductivity increases

C
Conductivity remains same

D
Conductivity does not depend on number of ions

Question 2
1 / -0

The given figure shows the corrosion of iron in atmosphere.

Fill in the blanks by choosing an appropriate option.
At a particular spot of an object made of iron, $$\underline{(i)}$$ of iron to ferrous ion takes place and that spot behaves as $$\underline{(ii)}$$. Electrons released at $$\underline{(i)}$$ spot move through the metal and go to another spot on the metal and reduce oxygen in presence of $$H^+$$. This spot behave as $$\underline{(iii)}$$. The ferrous ions are further oxidised by atmospheric oxygen to ferric ions which come out as rust, $$\underline{(iv)}$$ and with further production of $$\underline{(v)}$$ ions.

A
(i)- Oxidation, (ii)- Anode, (iii)-Cathode, (iv)- $$Fe_2O_3.xH_2O$$, (v)-Hydrogen

B
(i)- Reduction, (ii)-Cathode, (iii)-Anode, (iv)-$$Fe_3O_4$$, (v)-Hydrogen

C
(i)-Oxidation, (ii)-Cathode, (iii)-Anode, (iv)-$$Fe_2O_3xH_2O$$, (v)-Hydrogen

D
(i)-Oxidation, (ii)-Anode, (iii)-Cathode, (iv)-$$Fe_2O_3\cdot H_2O$$, (v)-Ferrous

Question 3
1 / -0

Which of the following reactions does not take place during rusting?

A
$$H_2CO_3\rightleftharpoons 2H^++CO^{2-}_3$$

B
$$4Fe^{2+}+O_{2(dry)}\rightarrow Fe_2O_3$$

C
$$4Fe^{2+}+O_2+4H_2O\rightarrow 2Fe_2O_3+8H^+$$

D
$$Fe_2O_3+xH_2O\rightarrow Fe_2O_3\cdot xH_2O$$

Question 4
1 / -0

A current of $$1.40$$ ampere is passed through $$500$$mL of $$0.180$$M solution of zinc sulphate for $$200$$ seconds. The molarity of $$Zn^{2+}$$ ions after deposition of zinc is:

A
$$0.154$$M

B
$$0.177$$M

C
$$2$$M

D
$$0.180$$M

Question 5
1 / -0

When an aqueous solution of $$AgNO_3$$ is electrolysed between platinum electrodes, the substances liberated at anode and cathode are:

A
Silver is deposited at cathode and $$O_2$$ is liberated at anode

B
Silver is deposited at cathode and $$H_2$$ is liberated at anode

C
Hydrogen is liberated at cathode and $$O_2$$ is liberated at anode

D
Silver is deposited at cathode and Pt is dissolved in electrolyte

Question 6
1 / -0

During electrolysis of a solution of $$AgNO_3$$, $$9650$$ coulombs of charge is passed through the solution. What will be the mass of silver deposited on the cathode?

A
$$108$$g

B
$$10.8$$g

C
$$1.08$$g

D
$$216$$g

Question 7
1 / -0

How many coulombs of electricity is required to reduce $$1$$ mole of $$Cr_2O^{2-}_7$$ in acidic medium?

A
$$4\times 96500$$ C

B
$$6\times 96500$$ C

C
$$2\times 96500$$ C

D
$$1\times 96500$$ C

Question 8
1 / -0

Which of the statements about solutions of electrolysis is not correct?

A
Conductivity of solution depends upon size of ions

B
Conductivity depends upon viscosity of solution

C
Conductivity does not depend upon solvation of ions present in solution

D
Conductivity of solution increases with temperature

Question 9
1 / -0

How many electrons are there in one coulomb of electricity?

A
$$

6.023 \times 10^{23}

$$

B
$$

1.64 \times 10^{ 24}

$$

C
$$

6.24 \times 10^{ 18}

$$

D
$$

6.24 \times 10^{ 24}

$$

Question 10
1 / -0

The ratio of weights of hydrogen and magnesium deposited by the same amount of electricity from aqueous $${ H }_{ 2 }SO_{ 4 }$$ and fused $$MgSO_{ 4 }$$ are:

A
1:8

B
1:12

C
1:16

D
1:1

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Electrochemistr...

Question 1

Conductivity decreases

Conductivity increases

Conductivity remains same

Conductivity does not depend on number of ions

Question 2

(i)- Oxidation, (ii)- Anode, (iii)-Cathode, (iv)- $$Fe_2O_3.xH_2O$$, (v)-Hydrogen

(i)- Reduction, (ii)-Cathode, (iii)-Anode, (iv)-$$Fe_3O_4$$, (v)-Hydrogen

(i)-Oxidation, (ii)-Cathode, (iii)-Anode, (iv)-$$Fe_2O_3xH_2O$$, (v)-Hydrogen

(i)-Oxidation, (ii)-Anode, (iii)-Cathode, (iv)-$$Fe_2O_3\cdot H_2O$$, (v)-Ferrous

Question 3

$$H_2CO_3\rightleftharpoons 2H^++CO^{2-}_3$$

$$4Fe^{2+}+O_{2(dry)}\rightarrow Fe_2O_3$$

$$4Fe^{2+}+O_2+4H_2O\rightarrow 2Fe_2O_3+8H^+$$

$$Fe_2O_3+xH_2O\rightarrow Fe_2O_3\cdot xH_2O$$

Question 4

$$0.154$$M

$$0.177$$M

$$2$$M

$$0.180$$M

Question 5

Silver is deposited at cathode and $$O_2$$ is liberated at anode

Silver is deposited at cathode and $$H_2$$ is liberated at anode

Hydrogen is liberated at cathode and $$O_2$$ is liberated at anode

Silver is deposited at cathode and Pt is dissolved in electrolyte

Question 6

$$108$$g

$$10.8$$g

$$1.08$$g

$$216$$g

Question 7

$$4\times 96500$$ C

$$6\times 96500$$ C

$$2\times 96500$$ C

$$1\times 96500$$ C

Question 8

Conductivity of solution depends upon size of ions

Conductivity depends upon viscosity of solution

Conductivity does not depend upon solvation of ions present in solution

Conductivity of solution increases with temperature

Question 9

$$6.023 \times 10^{23} $$

$$1.64 \times 10^{ 24} $$

$$6.24 \times 10^{ 18} $$

$$6.24 \times 10^{ 24} $$

Question 10

1:8

1:12

1:16

1:1

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$$

6.023 \times 10^{23}

$$

$$

1.64 \times 10^{ 24}

$$

$$

6.24 \times 10^{ 18}

$$

$$

6.24 \times 10^{ 24}

$$