Electrochemistry Test

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Electrochemistry Test - 15

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Question 1
1 / -0

Any article of iron if left in open for some time, acquires a film of brownish substance (rust) having chemical formula:

A
$$Fe_3O_4$$

B
$$Fe_2O_3$$

C
FeO

D
$$Fe(OH)_2$$

Solution

Iron reacts with air to form iron oxide(III) which is known by the name rust or rusting of iron. Rust is an iron oxide or red oxide formed by the redox reaction of iron and oxygen in the presence of water or air moisture. Rust consist of hydrated iron oxide.
Question 2
1 / -0

During the process of electrolysis of water, dilute sulphuric acid splits into

A
Oxygen ions and hydrogen ions

B
Oxygen ions, hydrogen ions and sulphur ions

C
Hydrogen ions, and suplphate ions

D
None of these

Solution

During the process of electrolysis of water, dilute sulphuric acid splits into when electricity is passed through the dilute sulfuric acid solution. The electrolyte is dilute sulfuric acid (= acidified water) which, during electrolysis is split into hydrogen and oxygen gases.
Question 3
1 / -0

In an electrolyte solution, current is maintained by the flow of:

A
electrons only

B
negative ions only

C
positive ions only

D
negative and positive ions both.

Solution

Answer is D.

A electrolytic solution allows the flow of ions to maintain a balance in charge between the oxidation and reduction vessels while keeping the contents of each separate. With the charge difference balanced, electrons can flow once again, and the reduction and oxidation reactions can proceed.
Hence, in an electrolyte solution, current is maintained by the flow of both negative and positive ions.
Question 4
1 / -0

An acid is a substance that produces ............. ions in a water solution

A
oxygen

B
nitrogen

C
carbon

D
hydrogen

Solution

Solutions of acids and bases produce some ions that can carry electric current, so they are said to be electrolytes.
Acids contain at least one hydrogen atom that can be removed when the acid is dissolved in water. An acid is a substance that produces hydrogen ions in a water solution. When an acid dissolves in water, hydrogen ions interact with water to form hydronium ions.
The strength of an acid or base depends on how many acid or base particles dissociate into ions in water. When a strong acid dissolves in water all molecules ionize into ions. When a weak acid dissolves in water a small fraction dissolve in water.
Question 5
1 / -0

Which is not true for electrolysis:

A
Electrolysis is used for depositing thin layer of one metal on other

B
Electrolysis is used for manufacturing some gases and compounds

C
Electrolysis can be used for refining of metals

D
Electrolysis can be used for electro plating of metals like gold & silver on other metals

Solution

Answer is B.

Electrolysis has wide applications in industries. Some of the important applications are, as follows.

(i) Production of hydrogen by electrolysis of water.
(ii) Manufacture of heavy water.
(iii) The metals like K, Mg, Al, etc., are obtained by electrolysis of fused electrolytes.
(iv) Non-metals like hydrogen, fluorine, chlorine are obtained by electrolysis.
(v) In this method pure metal is deposited at cathode from a solution containing the metal ions, etc.
(vi) Compounds like NaOH, KOH, white lead, etc. are synthesised by electrosynthesis method.
(vii) Electroplating: The process of coating an inferior metal with a superior metal by electrolysis is known as electroplating.
Hence, option B is incorrect.
Question 6
1 / -0

The active materials used in lead-acid battery are

A
Spongy lead and lead oxide $$(PbO_2)$$

B
$$PbO_2$$ and $$Pb_2O_3$$

C
Spongy lead and $$Pb_2O_3$$

D
only $$PbO_2$$
Question 7
1 / -0

In a dry cell _______ containing a moist paste of plaster of Paris, $$NH_4Cl$$ and $$ZnCl$$ acts as

A
Copper vessel, Cathode

B
Zinc vessel, Cathode

C
Zinc vessel, Anode

D
Copper vessel, Anode

Solution

Dry-cell batteries consist of a zinc chloride paste which allow a dry-cell to ... with moist paste of ammonium chloride $$(NH_4Cl)$$ where $$ZnCl_2$$ acts as Zinc vessel, Cathode. an electrolyte.A dry cell is a type of battery, commonly used for portable electrical devices.A standard dry cell comprises a zinc anode, usually in the form of a cylindrical pot, with a carbon cathode in the form of a central rod. The electrolyte is ammonium chloride in the form of a paste next to the zinc anode.
Question 8
1 / -0

________ can be obtained from bauxite by ______.

A
Aluminium, Electrolysis

B
Copper, Electroplating

C
Aluminium, Electroplating

D
Copper, Electrolysis

Solution

Aluminium can be obtained from bauxite by Electrolysis.
Bauxite is ore of Aluminium and Electrolysis is done to purify aluminium
Question 9
1 / -0

What happens when an electrolysis experiment is stopped and the battery terminals are reversed?

A
Electrolysis, will stop immediately.

B
The electrolysis proceeds and the rate of liberation remains the same.

C
The rate of liberation increases.

D
The rate of liberation decreases.

Solution

electrolysis chemical decomposition produced by passing an electric current through a liquid or solution containing ions.The electrolysis proceeds and the rate of liberation remains the same happens when an electrolysis experiment is stopped and the battery terminals are reversed
Question 10
1 / -0

Ammonium chloride used in dry cell acts as

A
Catalyst

B
Electrolyte

C
Polariser

D
Both $$(1)$$ and $$(3)$$

Solution

A dry cell is a type of battery, commonly used for portable electrical devices.A standard dry cell comprises a zinc anode, usually in the form of a cylindrical pot, with a carbon cathode in the form of a central rod. The electrolyte is ammonium chloride in the form of a paste next to the zinc anode.Ammonium chloride is a strong electrolyte. In dry cell, the electrolyte ammonium chloride forms ammonium ion and chloride ions.

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Electrochemistry Test - 15

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Question 1

$$Fe_3O_4$$

$$Fe_2O_3$$

FeO

$$Fe(OH)_2$$

Solution

Question 2

Oxygen ions and hydrogen ions

Oxygen ions, hydrogen ions and sulphur ions

Hydrogen ions, and suplphate ions

None of these

Solution

Question 3

electrons only

negative ions only

positive ions only

negative and positive ions both.

Solution

Question 4

oxygen

nitrogen

carbon

hydrogen

Solution

Question 5

Electrolysis is used for depositing thin layer of one metal on other

Electrolysis is used for manufacturing some gases and compounds

Electrolysis can be used for refining of metals

Electrolysis can be used for electro plating of metals like gold & silver on other metals

Solution

Question 6

Spongy lead and lead oxide $$(PbO_2)$$

$$PbO_2$$ and $$Pb_2O_3$$

Spongy lead and $$Pb_2O_3$$

only $$PbO_2$$

Question 7

Copper vessel, Cathode

Zinc vessel, Cathode

Zinc vessel, Anode

Copper vessel, Anode

Solution

Question 8

Aluminium, Electrolysis

Copper, Electroplating

Aluminium, Electroplating

Copper, Electrolysis

Solution

Question 9

Electrolysis, will stop immediately.

The electrolysis proceeds and the rate of liberation remains the same.

The rate of liberation increases.

The rate of liberation decreases.

Solution

Question 10

Catalyst

Electrolyte

Polariser

Both $$(1)$$ and $$(3)$$

Solution

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