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# Selina solutions for Class 8 Chemistry chapter 7 - Hydrogen

## Chapter 7: Hydrogen

#### Chapter 7: Hydrogen solutions [Page 0]

Fill in the blank

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

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

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

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

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

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

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

Indicate which of the following statements are true and which are false:

Hydrogen molecule is monovalent.

Indicate which of the following statements are true and which are false:

The removal of hydrogen from a substance is called reduction.

Indicate which of the following statements are true and which are false:

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

Indicate which of the following statements are true and which are false:

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

Indicate which of the following statements are true and which are false:

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

Indicate which of the following statements are true and which are false:

Hydrogen is combustible as well as a supporter of combustion.

Indicate which of the following statements are true and which are false:

Hydrogen gas is easily liquefiable.

Complete and balance the following equations:

(a)   ""H_2""+..................→ 2HCI

(b) ""H""_2 + S → ................

(c) ""Zn"" +.............→""ZnCl_2 + H_2

(d) ""CuO"" + ...............→ Cu +............

(e) ""Fe + H_2O →...............+............

(f) ""K+H_2  O →............+...............

Give reasons for the following:

Hydrogen be used as a fuel?

Give reasons for the following:

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

Give reasons for the following:

A pop sound produced when hydrogen is burnt?

Give reasons for the following:

Helium replaced hydrogen in weather observation balloons?

Give reasons for the following:

Nitric acid not used for the preparation of hydrogen gas?

Name the following:

Two metals which give hydrogen with cold water.

Name the following:

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

Name the following:

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

Name the following:

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

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

Give a balanced chemical equation for the reaction.

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

How is hydrogen gas collected?

How would you show that hydrogen:
(a) is a non-supporter of combustion?
(b) is lighter than air?

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

(a) Name a process by which hydrogen gas is manufactured.
(b) Give equations for the reactions.
(c) How is hydrogen separated from carbon dioxide and carbon monoxide?

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 of hydrogen or         addition of oxygen 4. sodium 5.  The addition of hydrogen or      removal of oxygen 5. Hydrogen

State four uses of hydrogen:

Define:

catalytic hydrogenation

Define

oxidation

Define

reduction

Define

redox reaction

Multiple Choice Question

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

1. hydrogen chloride
2. water
3. sodium hydroxide
4. hydrochloric acid

Multiple Choice Question

The metal which reacts with cold water to produce hydrogen is

1. magnesium
2. aluminium
3. calcium
4. iron

Multiple Choice Question

In metal activity series the more reactive metals are at

1. top
2. bottom
3. middle
4. none

Multiple Choice Question

Hydrogen is responsible for producing

1. heat and light
2. hydrogenated oil
3. fertilizers
4. all of the above

Multiple Choice Question

Hydrogen is

1. combustible
2. non-combustible
3. supporter of combustion
4. neither supporter nor combustible

Multiple Choice Question

Water gas is a mixture of

1. carbon monoxide and oxygen
2. carbon monoxide and hydrogen
3. hydrogen and oxygen
4. hydrogen and nitrogen.

#### Chapter 7: Hydrogen solutions [Page 0]

MULTIPLE CHOICE QUESTIONS

The name hydrogen was given by

1. Cavendish
2. Lavoisier
3. Haber
4. none of these

MULTIPLE CHOICE QUESTIONS

Which is the lightest of all elements?

1. hydrogen
2. helium
3. lithium
4. none of these

MULTIPLE CHOICE QUESTIONS

Hydrogen burns in oxygen to form

1. hydrogen sulphide
2. nitrates
3. water
4. ammonia

MULTIPLE CHOICE QUESTIONS

The process of adding oxygen to a substance is called

1. oxidation.
2. reduction.
3. displacement.
4. hydrogenation.

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........................... means ‘maker of water’ in Greek.

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In nature, hydrogen occurs as a .................. molecule represented as H2

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Sodium liberates hydrogen when treated with cold .............

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........................ zinc is preferred over pure zinc in the laboratory preparation of hydrogen.

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The compounds of carbon and hydrogen are called .................

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Hydrogen is present abundantly in the ................

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In electrolysis of water, dilute sulphuric acid is added to increase ..................of water.

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Ammonia is used to make ................

TRUE \ FALSE

Lead reacts briskly with dilute hydrochloric acid to form hydrogen.

TRUE \ FALSE

Hydrogen does not combine with nitrogen under ordinary conditions.

TRUE \ FALSE

reacts with hot water to form copper oxide and hydrogen.

TRUE \ FALSE

Hydrogen is a good oxidizing agent.

MATCH THE COLUMNS

 column A column  B 1. ""2H_2 + O_2 → 2H_2O A. This reaction is not         possible 2. ""H_2+CI_2 →2HCI B.This reaction is exothermic to the extent of explosion 3.""ZaO+ H^2→Zn +H_2O C.This reaction is known as Haber process 4.""Cu + H_2SO^4 → CuSO_4 + H_2  D.This reaction illustrates the reducing property of bydrogen 5.""N_2 +3H_2 → 2NH_3 +heat  E. This reaction takes place in diffused sunlight F. This reaction is a method of preparation of hydrogen

#### Chapter 7: Hydrogen solutions [Page 0]

Why is granulated zinc preferred in the laboratory preparation of hydrogen?

Give a test to identify hydrogen ?

Hydrogen gas is collected by the downward displacement of water. Give reason ?

Write two physical properties of hydrogen.

What is hydrogenation?

#### Chapter 7: Hydrogen solutions [Page 0]

Discuss the occurrence of hydrogen in the universe and on the earth ?

How do different metals displace hydrogen from water? Explain with the help of equations.

Describe two chemical properties of hydrogen with equations.

Why is hydrogen called a reducing agent? Give chemical equation to support your answer ?

Discuss the use of hydrogen as a fuel ?

## Selina solutions for Class 8 Chemistry chapter 7 - Hydrogen

Selina solutions for Class 8 Chemistry 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 Selina Concise Chemistry - Middle School for Class 8 (2018-19 Session) solutions in a manner that help students grasp basic concepts better and faster.

Further, we at shaalaa.com are providing 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 Class 8 Chemistry 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.

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