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# Selina solutions for Concise Chemistry Class 10 ICSE chapter 6 - Electrolysis [Latest edition]

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## Chapter 6: Electrolysis

Intext QuestionsExercise - 6

### Selina solutions for Concise Chemistry Class 10 ICSE Chapter 6 Electrolysis Intext Questions [Page 107]

Intext Questions | Q 1.1 | Page 107

Fill in the blanks :

Powdered sodium chloride (common salt) does not conduct an electric current, but it does so when ………....... or when ………........

Intext Questions | Q 1.2 | Page 107

Fill in the blanks :

Molten lead bromide conducts electricity. It is called an ………........ It is composed of lead ……….......and bromide ………........ The lead ions are ………....... charged and are called ………........ The bromide ……….......are ……….......charged and are called ………........

Intext Questions | Q 1.3 | Page 107

Fill in the blanks :

Substances which conduct electricity in the solid-state are generally ………........

Intext Questions | Q 1.4 | Page 107

Fill in the blanks :

The electron releasing tendency of zinc is ………....... than that of copper.

Intext Questions | Q 1.5 | Page 107

Fill in the blanks :

A solution of HCl gas in water conducts electricity because ………......., but a solution of HCl gas in toluene does not conduct an electric current because ……….......

Intext Questions | Q 1.6 | Page 107

Fill in the blank :

Pure water consists entirely of …………..

• ions

• molecules

Intext Questions | Q 1.7 | Page 107

Fill in the blank :

We can expect that pure water …………… normally conducts electricity.

• Will

• Will not

Intext Questions | Q 1.8 | Page 107

Fill in the blanks :

Electrolysis is the passage of……………. (electricity/electrons) through a liquid or a solution accompanied by a ………….. (physical/chemical) change.

Intext Questions | Q 2.1 | Page 107

Define the following term:

Electrolysis

Intext Questions | Q 2.2 | Page 107

Define the following term:

Non-electrolyte

Intext Questions | Q 2.3 | Page 107

Define the following term:

Cation and anion

Intext Questions | Q 2.4 | Page 107

Define the following term:
Weak electrolyte

Intext Questions | Q 3.1 | Page 107

What is the difference between:
Modern explanation and Arrhenius explanation for the theory of electrolysis:

Intext Questions | Q 3.2 | Page 107

What is the difference between:

electrolytic dissociation and ionization.

Intext Questions | Q 3.3 | Page 107

What is the difference between:
A cation and an anion

Intext Questions | Q 3.4 | Page 107

What is the difference between:
Electrolytic dissociation and thermal dissociation.

Intext Questions | Q 3.5 | Page 107

What is the difference between :

Strong electrolyte and weak electrolyte

Intext Questions | Q 4.1 | Page 107

Name a salt which is a weak electrolyte.

Intext Questions | Q 4.2 | Page 107

Name a base which is a weak electrolyte.

Intext Questions | Q 4.3 | Page 107

Name an inert electrode and an active electrode.

Intext Questions | Q 4.4 | Page 107

Name a positively charges non-metallic ion.

Intext Questions | Q 4.5 | Page 107

Name the electrode at which reduction occurs.

Intext Questions | Q 4.6 | Page 107

Name a non-metallic element which is a conductor of electricity.

Intext Questions | Q 5 | Page 107

Electrolysis is a redox process. Explain.

Intext Questions | Q 6 | Page 107

Classify the following substance under three headings:
(a) strong electrolytes (b) Weak electrolytes (c) Non-electrolytes.
Acetic acid, ammonium chloride, ammonium hydroxide, carbon tetrachloride, dilute hydrochloric acid, sodium acetate, dilute sulphuric acid.

Intext Questions | Q 7.1 | Page 107

Explain why:

Cu, though a good conductor of electricity, is a non-electrolyte.

Intext Questions | Q 7.2 | Page 107

Explain why:

Solid sodium chloride does not allow electricity to pass through.

Intext Questions | Q 8 | Page 107

Choose A, B, C or D to match the descriptions (i) to (v) below. Some letters may be repeated.

A. non-electrolyte

B. strong electrolyte

C. weak electrolyte

D. metallic conductor

i. Molten ionic compound
ii. Carbon tetrachloride
iii. An aluminum wire
iv. A solution containing solvent molecules, solute molecules, and ions formed by the dissociation of solute molecules.
v. A sugar solution with sugar molecules and water molecules.

Intext Questions | Q 9 | Page 107

An electrolyte Which completely dissociates into ions is :

• Alcohol

• Carbonic acid

• Sucrose

• Sodium hydroxide

### Selina solutions for Concise Chemistry Class 10 ICSE Chapter 6 Electrolysis Intext Questions [Page 113]

Intext Questions | Q 1.1 | Page 113

Name two substances in the following case:
Contain only molecules.

Intext Questions | Q 1.2 | Page 113

Name two substances in the following case:
Contain only ions.

Intext Questions | Q 1.3 | Page 113

Name two substances in the following case:

Contain ions as well as molecules.

Intext Questions | Q 2.1 | Page 113

Select the ion in each case, that would get selectively discharged from the aqueous mixture of the ions given below:

"SO"_4^(2-) , "NO"_3^- and "OH"^-

Intext Questions | Q 2.2 | Page 113

Select the ion in each case, that would get selectively discharged from the aqueous mixture of the ions given below:

"Pb"^(2+) , "Ag"^+ and "Cu"^(2+)

Intext Questions | Q 3.1 | Page 113

Among Zn and Cu, which would occur more readily in nature as metal and which as ion?

Intext Questions | Q 3.2 | Page 113

Why cannot we store AgNO3 solution in copper vessel?

Intext Questions | Q 3.3 | Page 113

Out of Cu and Ag, which is more active?

Intext Questions | Q 4.1 | Page 113

How would you change a metal like Cu into its ions?

Intext Questions | Q 4.2 | Page 113

how would you change Cu2+ ion to Cu?

Intext Questions | Q 5 | Page 113

A solution of caustic soda (NaOH) in water or when fused, conducts an electric current. What is the similarity in these two cases?

Intext Questions | Q 6 | Page 113

During electrolysis of an aqueous solution of sulphuric acid between platinum electrodes, two types of anions migrate towards the anode but only one of themis discharged:
(a) Name the two anions,
(b) Name the main product of the discharge of anion at the anode and write the anode reaction,
(c) Name the product at the cathode and write the reaction.
(d) How you notice any change in colour. State why?
(e) Why this electrolysis, is considered as an example of catalysis?

Intext Questions | Q 7 | Page 113

Copper sulphate solution is electrolysed using a platinum anode. Study the diagram given alongside and answer the following questions:

1. Give the names of the electrodes A and B.
2. Which electrode is the oxidising electrode?
Intext Questions | Q 8 | Page 113

To carry out the so-called “electrolysis of water”. Sulphuric acid is added to water. How does the addition of sulpuric acid produce a conducting solution?

Intext Questions | Q 9.1 | Page 113

Choosing only words from the following list, write down the appropriate words to fill in the blanks (a) to (e) below: anions, anode, cathode, cations, electrode, electrolyte, nickel, voltameter.
The electroplating of an article with nickel requires an
(a)_______which must be a solution containing (b)____ions. The article to be plated is placed as the (c)____of the cell in which the plating is carried out. The (d)____of the cell is made from pure nickel. The ions that are attracted to the negative electrode and discharged are called (e)________

Intext Questions | Q 9.2 | Page 113

When a molten ionic compound is electrolysed, the metal is always formed at …………… and the non-metal is formed at …………..

Intext Questions | Q 9.3 | Page 113

Electrolysis of acidulated water is an example of …………

• Reduction

• oxidation

• redox reaction

• synthesis

Intext Questions | Q 10.1 | Page 113

Explain the following:
A solution of cane sugar does not conduct electricity, but a solution of solution of sodium chloride is a good conductor.

Intext Questions | Q 10.2 | Page 113

Explain the following:

Hydrochloric acid is a good conductor of electricity.

Intext Questions | Q 10.3 | Page 113

Explain the following:

During the electrolysis of an aqueous solution of NaCI, hydrogen ion is reduced at the cathode and not the sodium ion though both Na+ and H+ ions are present in the solution.

Intext Questions | Q 10.4 | Page 113

Explain the following :

On electrolysis of dilute copper (II) sulphate solution, copper is deposited at the cathode but hydrogen gas evolves there.

Intext Questions | Q 10.5 | Page 113

Explain the following :

When a dilute aqueous solution of sodium chloride is electrolysed between platinum electrodes, hydrogen gas is evolved at the cathode but metallic sodium is not deposited. Why?

Intext Questions | Q 10.6 | Page 113

Explain the following :

Zinc can produce hydrogen on reacting with acids but copper cannot.

### Selina solutions for Concise Chemistry Class 10 ICSE Chapter 6 Electrolysis Exercise - 6 [Page 117]

Exercise - 6 | Q 1.01 | Page 117

Give reason for the following:
Electrolysis of molten lead bromide is considered to be a reaction in which oxidation and reduction go side by side, i.e., a redox reaction.

Exercise - 6 | Q 1.02 | Page 117

Give reason for the following:
The blue colour of aqueous copper sulphate fades when it is electrolysed using platinum electrodes.

Exercise - 6 | Q 1.03 | Page 117

Give reasons for the following:

Lead bromide undergoes electrolytic dissociation in the molten state but is a non-electrolyte in the solid-state.

Exercise - 6 | Q 1.04 | Page 117

Give reason for the following:
Aluminium is extracted from its oxide by electrolytic reduction and not by convectional reducing agents.

Exercise - 6 | Q 1.05 | Page 117

Give reason for the following:
The ratio of hydrogen and oxygen formed at the cathode and anode is 2: 1 by volume.

Exercise - 6 | Q 1.06 | Page 117

Give reason for the following:
In the electrolysis of acidified water, dilute sulphuric acid is preferred to dilute nitric acid for acidification.

Exercise - 6 | Q 1.07 | Page 117

Give a reason for the following:
Ammonia is unionized in the gaseous state but in the aqueous solution, it is a weak electrolyte.

Exercise - 6 | Q 1.08 | Page 117

Give a reason for the following:
A graphite anode is preferred to other inert electrodes during electrolysis of fused lead bromide.

Exercise - 6 | Q 1.09 | Page 117

Give reason for the following:
for electroplating with silver, silver nitrate is not used as electrolyte.

Exercise - 6 | Q 1.1 | Page 117

Give reason for the following:
carbon tetrachloride is a liquid but does not conduct electricity.

Exercise - 6 | Q 1.11 | Page 117

Give a reason for the following:

Potassium is not extracted by electrolysis of its aqueous salt solution.

Exercise - 6 | Q 2 | Page 117

(a) Copy and complete the following table which refers to two practical applications of electrolysis

 Anode Electrolyte Cathode Silver plating of a spoon A solution of potassium argentocyanide Purification of copper (iii) Extraction of sodium

(b) Write the equation taking place at the anode for Q. 2(a).

Exercise - 6 | Q 3.1 | Page 117

Draw a labeled diagram to show how iron is electroplated with copper.

Exercise - 6 | Q 3.2 | Page 117

Which solution is preferred as electrolyte, CuSO4 or FeSO4?

Exercise - 6 | Q 3.3 | Page 117

Describe what happens to the iron object and the copper rod.

Exercise - 6 | Q 4.1 | Page 117

Element X is a metal with a valency 2. Element Y is a non-metal with a valency 3.

Write equations to show how X and Y form ions?

Exercise - 6 | Q 4.2 | Page 117

Element X is a metal with a valency 2. Element Y is a non-metal with a valency 3.

If Y is a diatomic gas, write the equation for the direct combination of X and Y to form a compound.

Exercise - 6 | Q 4.3 | Page 117

Element X is a metal with a valency 2. Element Y is a non-metal with a valency 3.

If the compound formed between X and Y is melted and an electric current passed through the molten compound, the element X will be obtained at the _____ and Y at the _________of the electrolytic cell.(Provide the missing words)

Exercise - 6 | Q 5 | Page 117

Write two applications of electrolysis in which the anode diminishes in mass.

Exercise - 6 | Q 6.1 | Page 117

What kind of particles will be found in a liquid compound which is a non- electrolyte?

Exercise - 6 | Q 6.2 | Page 117

If HX is a weak acid, what particles will be present in its dilute solution apart from those of water?

Exercise - 6 | Q 6.3 | Page 117

Cations are formed by ____ (loss/gain) of electrons and anions are formed by _________(loss/gain) of electrons. (Choose the correct word to fill in blank)

Exercise - 6 | Q 6.4 | Page 117

What ions must be present in a solution used for electroplating a particular metal?

Exercise - 6 | Q 7 | Page 117

A strip of copper is placed in four different colorless salt solutions. They are KNO3, AgNO3Zn(NO3)2 and Ca(NO3)2. Which one of the solutions will finally turn blue?

## Chapter 6: Electrolysis

Intext QuestionsExercise - 6

## Selina solutions for Concise Chemistry Class 10 ICSE chapter 6 - Electrolysis

Selina solutions for Concise Chemistry Class 10 ICSE chapter 6 (Electrolysis) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has the CISCE Concise Chemistry Class 10 ICSE solutions in a manner that help students grasp basic concepts better and faster.

Further, we at Shaalaa.com provide such solutions so that students can prepare for written exams. Selina textbook solutions can be a core help for self-study and acts as a perfect self-help guidance for students.

Concepts covered in Concise Chemistry Class 10 ICSE chapter 6 Electrolysis are Electrolytes and Non-Electrolytes, Substances Containing Molecules Only, Ions Only, Both Molecules and Ions., Electrolysis, An Elementary Study of the Migration of Ions, Applications of Electrolysis, Concept of Electrolysis, Acids, Bases and Salts as Electrolytes, Dissociation of Ions and Electrical Conductivity, Substances Containing Molecules Only, Substances Containing Ions Only, Applications of Electrolysis - Purification of Copper, Substances Containing Both Molecules and Ions, Electroplating.

Using Selina Class 10 solutions Electrolysis exercise by students are an easy way to prepare for the exams, as they involve solutions arranged chapter-wise also page wise. The questions involved in Selina Solutions are important questions that can be asked in the final exam. Maximum students of CISCE Class 10 prefer Selina Textbook Solutions to score more in exam.

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