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Selina solutions for Concise Chemistry Class 8 ICSE chapter 7 - Hydrogen [Latest edition]

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Concise Chemistry Class 8 ICSE - Shaalaa.com

Chapter 7: Hydrogen

Exercise
Exercise [Pages 98 - 99]

Selina solutions for Concise Chemistry Class 8 ICSE Chapter 7 Hydrogen Exercise [Pages 98 - 99]

Exercise | Q 1.1 | Page 98

Fill in the blank

Hydrogen is ..................... than air.

Exercise | Q 1.2 | Page 98

Fill in the blank

Hydrogen is ...................soluble in water.

Exercise | Q 1.3 | Page 98

 Fill in the blank:

Hydrogen bums with a .....................................flame and...................... sound is heard.

Exercise | Q 1.4 | Page 98

Fill in the blank

A metal .................. hydrogen in the reactivity series gives hydrogen with ..................

Exercise | Q 1.5 | Page 98

Fill in the blank

Hydrogen reacts with metal oxides to form ............and....................

Exercise | Q 1.6 | Page 98

Fill in the blank

 Oxidation is the removal of ......................and addition of ....................

Exercise | Q 1.7 | Page 98

Fill in the blank

In redox reaction oxidation and reduction occur ............................

Exercise | Q 2.1 | Page 98

Indicate which of the following statement is true and which is false:

Hydrogen molecule is monovalent.

  • True

  • False

Exercise | Q 2.2 | Page 98

Indicate which of the following statement is true and which is false:

The removal of hydrogen from a substance is called reduction.

  • True

  • False

Exercise | Q 2.3 | Page 98

Indicate which of the following statement is true and which is false:

Nitric acid can not be used to prepare hydrogen by its action on active metals ? 

  • True

  • False

Exercise | Q 2.4 | Page 98

Indicate which of the following statement is true and which is false: 

The reaction between hydrogen and nitrogen to form ammonia is reversible.

  • True

  • False

Exercise | Q 2.5 | Page 98

Indicate which of the following statement is true and which is false: 

Zinc can liberate hydrogen from water, acid and alkali solution.

  • True

  • False

Exercise | Q 2.6 | Page 98

Indicate which of the following statement is true and which is false:

Hydrogen is combustible as well as a supporter of combustion.

  • True

  • False

Exercise | Q 2.7 | Page 98

Indicate which of the following statement is true and which is false:

Hydrogen gas is easily liquefiable. 

  • True

  • False

Exercise | Q 3.1 | Page 98

Complete and balance the following equation:

H2+____________→ 2HCI

Exercise | Q 3.2 | Page 98

 Complete and balance the following equation:

H2 + S → ___________

Exercise | Q 3.3 | Page 98

Complete and balance the following equation:

Zn +_________________→ZnCl2 + H2 

Exercise | Q 3.4 | Page 98

Complete and balance the following equation:

CuO +__________→ Cu +___________

Exercise | Q 3.5 | Page 98

Complete and balance the following equation:

Fe + H2O →___________+____________

Exercise | Q 3.6 | Page 98

Complete and balance the following equation:

 K+H2  O →__________+____________

Exercise | Q 4.1 | Page 98

Give reasons for the following:

 Hydrogen be used as a fuel?

Exercise | Q 4.2 | Page 98

Give reason for the following:

Though hydrogen is lighter than air it cannot be collected by downward displacement of air.

Exercise | Q 4.3 | Page 98

Give reason for the following:

A pop sound produced when hydrogen is burnt?

Exercise | Q 4.4 | Page 98

 Give reason for the following:

Helium replaced hydrogen in weather observation balloons?

Exercise | Q 4.5 | Page 99

Give reason for the following:

Nitric acid not used for the preparation of hydrogen gas?

Exercise | Q 5.1 | Page 99

 Name the following:

Two metals which give hydrogen with cold water.

Exercise | Q 5.2 | Page 99

Name the following:

 A metal which liberates hydrogen only when steam is passed over red hot metal.

Exercise | Q 5.3 | Page 99

Name the following:

The process in which oxygen is added or hydrogen is removed.

Exercise | Q 5.4 | Page 99

 Name the following:

 A metallic oxide which can be reduced into metal by hydrogen.

Exercise | Q 6.1 | Page 99

Name the chemicals required to prepare hydrogen gas in the laboratory.

Exercise | Q 6.2 | Page 99

Give a balanced chemical equation for the reaction.

Exercise | Q 6.3 | Page 99

Draw a neat and well-labelled diagram for the laboratory preparation ofhydrogen.

Exercise | Q 6.3 | Page 99

How is hydrogen gas collected?

Exercise | Q 7.1 | Page 99

How would you show that hydrogen is a non-supporter of combustion?

Exercise | Q 7.2 | Page 99

How would you show that hydrogen is lighter than air?

Exercise | Q 8 | Page 99

 Hydrogen is a good reducing agent: What do you understand by the above statement? Explain with the help of copper oxide as an example.

Exercise | Q 9.1 | Page 99

Name a process by which hydrogen gas is manufactured.

Exercise | Q 9.2 | Page 99

Give equations for the reactions.

Exercise | Q 9.3 | Page 99

How is hydrogen separated from carbon dioxide and carbon monoxide? 

Exercise | Q 10 | Page 99

Match the statements in Column A with those in Column B.

      Column A               Column B 

1. A metal which reacts with cold water to from hydrogen.

1. Reduction 
2. A gas which is inflammable and non-supporter of combustion   2. Hydrogenation

3. A process in which  vanspati ghee is prepared  from vegitable oils 

3. oxidation 

 4. The removal ofhydrogen or  addition of oxygen 

4. sodium
5. The addition of hydrogen or  removal of oxygen    5. Hydrogen
Exercise | Q 11 | Page 99

State four uses of hydrogen: 

Exercise | Q 12.1 | Page 99

Define catalytic hydrogenation.

Exercise | Q 12.2 | Page 99

Define oxidation.

Exercise | Q 12.3 | Page 99

Define reduction.

Exercise | Q 12.4 | Page 99

Define redox reaction.

Exercise | Q 13.1 | Page 99

 Multiple Choice Question

 Equal volumes of hydrogen and chlorine are exposed to diffused sunlight to prepare

  • hydrogen chloride

  • water

  • sodium hydroxide

  • hydrochloric acid

Exercise | Q 13.2 | Page 99

Multiple Choice Question

The metal which reacts with cold water to produce hydrogen is

  • magnesium

  • aluminium

  • calcium

  • iron

Exercise | Q 13.3 | Page 99

Multiple Choice Question

 In metal activity series the more reactive metals are at

  • top

  • bottom

  • middle

  • none

Exercise | Q 13.4 | Page 99

Multiple Choice Question

Hydrogen is responsible for producing

  • heat and light

  • hydrogenated oil

  • fertilizers

  • all of the above

Exercise | Q 13.5 | Page 99

 Multiple Choice Question

Hydrogen is

Exercise | Q 13.6 | Page 99

Multiple Choice Question

Water gas is a mixture of

  • carbon monoxide and oxygen

  • carbon monoxide and hydrogen

  • hydrogen and oxygen

  • hydrogen and nitrogen.

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Chapter 7: Hydrogen

Exercise
Concise Chemistry Class 8 ICSE - Shaalaa.com

Selina solutions for Concise Chemistry Class 8 ICSE chapter 7 - Hydrogen

Selina solutions for Concise Chemistry Class 8 ICSE chapter 7 (Hydrogen) 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 8 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 8 ICSE chapter 7 Hydrogen are Preparation of Hydrogen, from Water – Electrolysis, Preparation of Hydrogen in the Laboratory, Preference of Zinc as the Metal to Be Used (With Reasons)., Choice of Dilute Acids (Other than Dil. Nitric Acid), Concept of Bosch’S Process, Properties and Uses of Hydrogen, Hydrogen - Oxidation and Reduction, Concept of Hydrogen.

Using Selina Class 8 solutions Hydrogen 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 8 prefer Selina Textbook Solutions to score more in exam.

Get the free view of chapter 7 Hydrogen Class 8 extra questions for Concise Chemistry Class 8 ICSE and can use Shaalaa.com to keep it handy for your exam preparation

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