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Selina solutions for Concise Chemistry Class 8 ICSE chapter 6 - Chemical Reactions [Latest edition]

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Concise Chemistry Class 8 ICSE - Shaalaa.com

Chapter 6: Chemical Reactions

Exercise-1Exercise-2

Exercise-1 [Page 73]

Selina solutions for Concise Chemistry Class 8 ICSE Chapter 6 Chemical Reactions Exercise-1 [Page 73]

Exercise-1 | Q 1.1 | Page 73

 Define a chemical reaction.

Exercise-1 | Q 1.2 | Page 73

 What happens during a chemical reaction ?

Exercise-1 | Q 1.3 | Page 73

What do you understand by a chemical bond ?

Exercise-1 | Q 2.1 | Page 73

Give one example each of which illustrates the following characteristics of a chemical reaction:

evolution of a gas

Exercise-1 | Q 2.2 | Page 73

Give one example each of which illustrates the following characteristics of a chemical reaction:

change of colour

Exercise-1 | Q 2.3 | Page 73

Give one example each of which illustrates the following characteristics of a chemical reaction change in state

Exercise-1 | Q 3.1 | Page 73

How do the following help in bringing about a chemical change?

pressure.

Exercise-1 | Q 3.2 | Page 73

How do the following help in bringing about a chemical change?

light.

Exercise-1 | Q 3.3 | Page 73

How do the following help in bringing about a chemical change?

catalyst .

Exercise-1 | Q 3.4 | Page 73

How do the following help in bringing about a chemical change?

heat. 

Exercise-1 | Q 4.1 | Page 73

Define; catalyst.

Exercise-1 | Q 4.2 | Page 73

 What are (i) positive catalysts and (ii) negative catalysts? Support your answer with one example for each of them.

Exercise-1 | Q 4.3 | Page 73

Name three biochemical catalysts found in the human body.

Exercise-1 | Q 5.1 | Page 73

What do you observe when dilute sulphuric acid is added to granulated zinc?

Exercise-1 | Q 5.2 | Page 73

What do you observe when a few pieces of iron are dropped in a blue solution of copper sulphate?

Exercise-1 | Q 5.3 | Page 73

What do you observe when silver nitrate is added to a solution of sodium chloride?

Exercise-1 | Q 5.4 | Page 73

What do you observe when ferrous sulphate solution is added to an aqueous solution of sodium hydroxide.

Exercise-1 | Q 5.6 | Page 73

What do you observe when when dilute sulphuric acid is added to barium chloride solution ?

Exercise-1 | Q 6.1 | Page 73

Complete and balance the following chemical equations:

`"N"_2` + `"O"_2`   `→`

Exercise-1 | Q 6.2 | Page 73

Complete and balance the following chemical equations:

`"H"_2"S"` + `"CI"_2`  `→`  

Exercise-1 | Q 6.3 | Page 73

Complete and balance the following chemical equations

Na + H2 O →

Exercise-1 | Q 6.4 | Page 73

Complete and balance the following chemical equations

NaCI + `AgNO_3`  `→`

Exercise-1 | Q 6.5 | Page 73

Complete and balance the following chemical equations:

Zn + `"H"_2"SO"_4`  `→`

           (dil)

Exercise-1 | Q 6.6 | Page 73

Complete and balance the following chemical equations:

Fe `"SO"_4`  + NaOH  `→`

   (aq.)          (aq.)

Exercise-1 | Q 6.7 | Page 73

Complete and balance the following chemical equations:

\[\ce{Pb(NO3)2->[heat]}\] _________

Exercise-1 | Q 6.8 | Page 73

Complete and balance the following chemical equations:

Ba`"CI"_2`   +  `"H"_2"SO"_4`   `→`

    (aq.)           (aq.)

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Exercise-2 [Pages 85 - 86]

Selina solutions for Concise Chemistry Class 8 ICSE Chapter 6 Chemical Reactions Exercise-2 [Pages 85 - 86]

Exercise-2 | Q 1.01 | Page 85

 Fill in the blank

A reaction in which two or more substances combine to form a single substance is called a ............ reaction.

Exercise-2 | Q 1.02 | Page 85

Fill in the blanK

 A .............is a substance which changes the rate of a chemical reaction without undergoing a chemical change.

Exercise-2 | Q 1.03 | Page 85

 Fill in the blank.
 The formation of gas bubbles in a liquid during a reaction is called ......................

Exercise-2 | Q 1.04 | Page 85

Fill in the blank.

The reaction between an acid and a base is called ..................

Exercise-2 | Q 1.05 | Page 85

 Fill in the blank .

Soluble bases are called ............

Exercise-2 | Q 1.06 | Page 85

Fill in the blank.

The chemical change involving iron and hydrochloric acid illustrates a ...............reaction.

Exercise-2 | Q 1.07 | Page 85

Fill in the blank

In the type of reaction called ....................................., ions two compounds exchange their positive and negative radicals ions respectively.

Exercise-2 | Q 1.08 | Page 85

Fill in the blank

 A catalyst either ................or ............... the rate of a chemical change but itself remains ............... at the end of the reaction.

Exercise-2 | Q 1.09 | Page 85

 Fill in the blank

The chemical reaction between hydrogen and chlorine is a ................ reaction

Exercise-2 | Q 1.1 | Page 85

Fill in the blank

When a piece of copper is added to silver nitrate solution, it turns ............in colour.

Exercise-2 | Q 2.1 | Page 86

Classify the following reactions as combination . Also balance the equations.

Also balance the equations.
(a) \[\ce{CaCO3(s)->[heat]CaO(s)+CO2(g)}\]
(b) Zn(s) +`"H"_2"SO"_4`  `→`  `"ZnSO"_4` (S) + `"H"_2` (g) 

(c) `"AgNO"_3` (aq)  + NaCI (aq) `→` Ag CI (S) + `"NaNO"_3` 

(d) `"NH"_3` (g) + HCI (g)  `→` `"NH"_4` CI (S)

(e) `"CuSO"_4` (aq)  + `"H"_2"S"` (g)  `→` CuS (S) + `"H"_2"SO"_4` (I)

(f) Zn (S) + `"CuSO"_4` (aq)  `→` `"ZnSO"_4` N  (aq) + Cu  (s) 

(g)\[\ce{Ca(s)O2(g)->[heat]CaO(s)}\]

(H) NaOH + HCI  `→` NaCI + `"H"_2"O"` 

(I) KOH + `"H"_2"SO"_4`  `→` `"K"_2"SO"_4`  + `"H"_2"O"`

Exercise-2 | Q 2.2 | Page 86

Classify the following reactions as decomposition, Also balance the equations.

(A) \[\ce{CaCO3(s)->[heat]CaO(s)+CO2(g)}\]

(B) Zn(s) +`"H"_2"SO"_4`  `→`  `"ZnSO"_4` (S) + `"H"_2` (g) 

(C) `"AgNO"_3` (aq)  + NaCI (aq) `→` Ag CI (S) + `"NaNO"_3` 

(D) `"NH"_3` (g) + HCI (g)  `→` `"NH"_4` CI (S)
(E) `"CuSO"_4` (aq)  + `"H"_2"S"` (g)  `→` CuS (S) + `"H"_2"SO"_4` (I)

(F) Zn (S) + `"CuSO"_4` (aq)  `→` `"ZnSO"_4` N  (aq) + Cu  (s) 

(g) \[\ce{Ca(s)O2(g)->[heat]CaO(s)}\]

(H) NaOH + HCI  `→` NaCI + `"H"_2"O"` 

(I) KOH + `"H"_2"SO"_4`  `→` `"K"_2"SO"_4`  + `"H"_2"O"` 

Exercise-2 | Q 2.3 | Page 85

Classify the following reactions as decomposition, Also balance the equations.

(A) \[\ce{CaCO3(s)->[heat]CaO(s)+CO2(g)}\]

(B) Zn(s) +`"H"_2"SO"_4`  `→`  `"ZnSO"_4` (S) + `"H"_2` (g) 

(C) `"AgNO"_3` (aq)  + NaCI (aq) `→` Ag CI (S) + `"NaNO"_3` 

(D) `"NH"_3` (g) + HCI (g)  `→` `"NH"_4` CI (S)
(E) `"CuSO"_4` (aq)  + `"H"_2"S"` (g)  `→` CuS (S) + `"H"_2"SO"_4` (I)

(F) Zn (S) + `"CuSO"_4` (aq)  `→` `"ZnSO"_4` N  (aq) + Cu  (s) 

(g) \[\ce{Ca(s)O2(g)->[heat]CaO(s)}\]

(H) NaOH + HCI  `→` NaCI + `"H"_2"O"` 

(I) KOH + `"H"_2"SO"_4`  `→` `"K"_2"SO"_4`  + `"H"_2"O"`  

Exercise-2 | Q 2.4 | Page 85

Classify the following reactions as decomposition, Also balance the equations.

(A) \[\ce{CaCO3(s)->[heat]CaO(s)+CO2(g)}\]

(B) Zn(s) +`"H"_2"SO"_4`  `→`  `"ZnSO"_4` (S) + `"H"_2` (g) 

(C) `"AgNO"_3` (aq)  + NaCI (aq) `→` Ag CI (S) + `"NaNO"_3` 

(D) `"NH"_3` (g) + HCI (g)  `→` `"NH"_4` CI (S)
(E) `"CuSO"_4` (aq)  + `"H"_2"S"` (g)  `→` CuS (S) + `"H"_2"SO"_4` (I)

(F) Zn (S) + `"CuSO"_4` (aq)  `→` `"ZnSO"_4` N  (aq) + Cu  (s) 

(g) \[\ce{Ca(s)O2(g)->[heat]CaO(s)}\]

(H) NaOH + HCI  `→` NaCI + `"H"_2"O"` 

(I) KOH + `"H"_2"SO"_4`  `→` `"K"_2"SO"_4`  + `"H"_2"O"`  

Exercise-2 | Q 2.5 | Page 85

Classify the following reactions as  neutralization .Also balance the equations.

Also balance the equations.

(A) \[\ce{CaCO3(s)->[heat]CaO(s)+CO2(g)}\]

(B) Zn(s) +`"H"_2"SO"_4`  `→`  `"ZnSO"_4` (S) + `"H"_2` (g) 

(C) `"AgNO"_3` (aq)  + NaCI (aq) `→` Ag CI (S) + `"NaNO"_3` 

(D) `"NH"_3` (g) + HCI (g)  `→` `"NH"_4` CI (S)
(E) `"CuSO"_4` (aq)  + `"H"_2"S"` (g)  `→` CuS (S) + `"H"_2"SO"_4` (I)

(F) Zn (S) + `"CuSO"_4` (aq)  `→` `"ZnSO"_4` N  (aq) + Cu  (s) 

(G) \[\ce{Ca(s)O2(g)->[heat]CaO(s)}\]

(H) NaOH + HCI  `→` NaCI + `"H"_2"O"` 

(I) KOH + `"H"_2"SO"_4`  `→` `"K"_2"SO"_4`  + `"H"_2"O"`

Exercise-2 | Q 3.1 | Page 86

Define precipitation.

Exercise-2 | Q 3.2 | Page 86

Define neutralization.

Exercise-2 | Q 3.3 | Page 86

Define catalyst.

Exercise-2 | Q 4.1 | Page 86

Explain the following types of chemical reactions giving two examples for them combination reaction.

Exercise-2 | Q 4.2 | Page 86

Explain the following types of chemical reactions giving two examples for each of them decomposition reaction .

Exercise-2 | Q 4.3 | Page 86

Explain the following types of chemical reactions giving two examples for each of them displacement reaction.

Exercise-2 | Q 4.4 | Page 86

Explain the following types of chemical reactions giving two examples for each of them double decomposition reaction.

Exercise-2 | Q 5.1 | Page 86

Write the missing reactants and products and balance the equations.

NaOH + ............... `→` NaCI + ...................

Exercise-2 | Q 5.2 | Page 86

Write the missing reactants and products and balance the equations.

\[\ce{KCIO3 ->[heat]}\] ___________+ ____________

Exercise-2 | Q 5.3 | Page 86

Write the missing reactants and products and balance the equations.

................+ HCI `→` NaCI + `"H"_2"O"` + .........................

Exercise-2 | Q 6.1 | Page 86

How will you obtain Magnesium oxide from magnesium.

Also give balanced equations for the reactions

Exercise-2 | Q 6.2 | Page 86

How will you obtain  Silver chloride from silver nitrate.

Also give balanced equations for the reactions

Exercise-2 | Q 6.3 | Page 86

How will you obtain  Nitrogen dioxide from lead nitrate.
Also give balanced equations for the reactions

Exercise-2 | Q 6.4 | Page 86

How will you obtain Zinc chloride from zinc.

Also give balanced equations for the reactions

Exercise-2 | Q 6.5 | Page 86

How will you obtain Ammonia from nitrogen.
Also give balanced equations for the reactions

Exercise-2 | Q 7.1 | Page 86

What do you observe when Iron nail is kept in copper sulphate solution for sometime.

Exercise-2 | Q 7.2 | Page 86

What do you observe when Phenolphthalein is added to sodium hydroxide solution.

Exercise-2 | Q 7.3 | Page 86

What do you observe when Blue litmus paper is dipped in dilute hydrochloric acid.

Exercise-2 | Q 7.4 | Page 86

What do you observe when Lead nitrate is heated.

Exercise-2 | Q 7.5 | Page 86

What do you observe when Magnesium ribbon is burnt in oxygen.

Exercise-2 | Q 7.6 | Page 86

What do you observe when Ammonia is brought in contact of hydrogen chloride.gas.

Exercise-2 | Q 8.1 | Page 86

Give reason .

A person suffering from acidity is advised to take an antacid.

Exercise-2 | Q 8.2 | Page 86

Give reason.

Acidic soil is treated with quick lime.

Exercise-2 | Q 8.3 | Page 86

Give reason.

Wasp sting is treated with vinegar.

Exercise-2 | Q 9 | Page 86

What is meant by the metal reactivity series ? State its importance, (any two points).

Exercise-2 | Q 10.1 | Page 86

What are oxides ? 

Exercise-2 | Q 10.2 | Page 86

Give two examples Basic oxide .

Exercise-2 | Q 10.3 | Page 86

Give two examples of  oxides.

Acidic oxide.

Exercise-2 | Q 10.4 | Page 86

Give two examples of  oxides.

Amphoteric oxide

Exercise-2 | Q 10.5 | Page 86

Give two examples of oxides.

 Neutral oxide

Exercise-2 | Q 11.1 | Page 86

Define exothermic reactions. Give two examples of each.

Exercise-2 | Q 11.2 | Page 86

Define  endothermic reactions. Give two examples of each.

Exercise-2 | Q 12.1 | Page 86

State the effect of an endothermic reaction.

Exercise-2 | Q 12.2 | Page 86

State the effect of  an exothermic reaction on the surroundings.

Exercise-2 | Q 13.1 | Page 86

What do you observe when an acid is added to a basic solution.

Exercise-2 | Q 13.2 | Page 86

What do you observe when ammonium chloride is dissolved in water.

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Chapter 6: Chemical Reactions

Exercise-1Exercise-2
Concise Chemistry Class 8 ICSE - Shaalaa.com

Selina solutions for Concise Chemistry Class 8 ICSE chapter 6 - Chemical Reactions

Selina solutions for Concise Chemistry Class 8 ICSE chapter 6 (Chemical Reactions) 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 6 Chemical Reactions are Types of Reactions - Combination, Types of Reactions - Decomposition, Types of Reactions - Displacement, Types of Reactions - Double Displacement, Reactivity Series - in Reactivity Series Metals Are Arranged in Order of Their Reactivity, Reactivity Series - Metal that Displaces the Metal Ion from the Solution is More Reactive., Predict the Reactivity of Metals, Endothermic and Exothermic Processes/ Reactions, Neutralization Reaction, Decomposition Reactions to Form Oxides, Classification of Oxides - Metal Oxides Are Basic, Classification of Oxides - Nonmetal Oxides Are Acidic in Nature, Classification of Oxides - Basic Oxides React with Acids, Amphoteric Oxides - Some Oxides Such as Zno, Pbo React Both with Acids and Bases, Concept for Chemical Reactions.

Using Selina Class 8 solutions Chemical Reactions 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 6 Chemical Reactions 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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