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    Worksheet-1 (Chemical Reaction)

    Uploaded by

    Sachin Garg
    The document contains 10 questions about chemical reactions from 4 worksheets. It asks about identifying oxidation-reduction reactions, displacement reactions, types of chemical equations, and factors that cause corrosion or food spoilage. It also contains questions testing understanding of concepts like redox reactions, oxidizing and reducing agents, and classifying reaction types like decomposition, displacement, and double displacement.

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    © All Rights Reserved
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    Worksheet-1 (Chemical Reaction)

    Uploaded by

    Sachin Garg
    786 views6 pages
    The document contains 10 questions about chemical reactions from 4 worksheets. It asks about identifying oxidation-reduction reactions, displacement reactions, types of chemical equations, and factors that cause corrosion or food spoilage. It also contains questions testing understanding of concepts like redox reactions, oxidizing and reducing agents, and classifying reaction types like decomposition, displacement, and double displacement.

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    class 10th chem

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    The document contains 10 questions about chemical reactions from 4 worksheets. It asks about identifying oxidation-reduction reactions, displacement reactions, types of chemical equations, and factors that cause corrosion or food spoilage. It also contains questions testing understanding of concepts like redox reactions, oxidizing and reducing agents, and classifying reaction types like decomposition, displacement, and double displacement.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    786 views6 pages

    Worksheet-1 (Chemical Reaction)

    Uploaded by

    Sachin Garg
    The document contains 10 questions about chemical reactions from 4 worksheets. It asks about identifying oxidation-reduction reactions, displacement reactions, types of chemical equations, and factors that cause corrosion or food spoilage. It also contains questions testing understanding of concepts like redox reactions, oxidizing and reducing agents, and classifying reaction types like decomposition, displacement, and double displacement.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 6

    Worksheet-1 (Chemical Reaction)

    Q.1 How do we come to know that a chemical reaction has taken place ?

    Q.2 What is an oxidation reaction ? Identify in the following reaction :

    (i) The substance oxidised,

    (ii) The substance reduced :

    ZnO + C  Zn + CO

    Q.3 Why cannot we stir silver nitrate solution with copper spoon ?

    Q.4 Among the following displacement reactions which one will take place and which one will not
    occur and why ?

    (i) MgSO4(aq) + Zn(s)  ZnSO4(aq) + Mg(s)

    (ii) CuSO4(aq) + Fe(s)  FeSO4(aq) + Cu(s)

    Q.5 What is an oxidation reaction ? Give an example of oxidation reaction. Is oxidation an exothermic or
    an endothermic reaction.

    Q.6 On the basis of the following chemical equations, find out which is the least reactive metal
    amongst iron, copper and zinc ?

    (i) FeSO4(aq) + Zn(s)  ZnSO4(aq) + Fe(s)

    (ii) CuSO4(aq) + Fe(s)  FeSO4(aq) + Fe(s)

    Q.7 What happens when iron nails are put in copper sulphate solution ?

    (i) Write the equation for the reaction that takes place

    (ii) Name the type of reaction involved

    Q.8 What type of chemical equation are the following equations :

    (i) A + BC  AC + B

    (ii) A + B  AB

    (iii) AB  A + B

    (iv) AB + CD  AD + CB

    Q.9 Why does stale food give a bad taste and bad smell ?

    Q.10 Why do silver, gold and platinum not corrode in moist air ?

    Concept Coaching Classes


    Worksheet-2 (Chemical Reaction)
    Q.1 What is a chemical equation ?

    Q.2 What is a skeletal equation ?

    Q.3 Name the term used for the solution of a substance in water

    Q.4 In electrolysis of water. Why is the volume of gas collected over one electrode double that of gas
    collected over the other electrode

    Q.5 Give reason for keeping hydrogen peroxide in coloured bottles ?

    Q.6 Balance the following chemical equation :

    NaOH + H2SO4  Na2SO4 + H2O

    Q.7 On the basis of the following reactions, indicate which is most reactive and which is least reactive
    metal out of zinc, copper and iron.

    CuSO4(aq) + Fe(s)  FeSO4(aq) + Cu(s)

    FeSO4(aq) + Zn(g)  ZnSO4(aq) + Fe(s)

    Q.8 Ina chemical equation, what do the notations (s), (l) and (g) stand for ?

    Q.9 Balance the following chemical equation :

    FeCl2 + H2S  HCl + FeS

    Q.10 Write two condition for rusting of an iron article.

    Concept Coaching Classes


    Worksheet-3 (Chemical Reaction)
    Q.1 Why is that when a metal reacts with a non-metal, the reaction is always a redox reaction ?

    Q.2 What are the two methods which can prevent the rancidity fatty foods ?

    Q.3 Find the oxidising and reducing agent in the following reaction :

    PbS(s) + 4H2O2(aq)  PbSO4(s) + 4H2O(l)

    Q.4 It is said that "decomposition of calcium carbonate to calcium oxide and carbon dioxide on heating
    is an important decomposition reaction used in various industries". Explain how ?

    Q.5 What happen when green coloured crystals of ferrous sulphate are heated ? Which term is used
    to represent such type of reaction ?

    Q.6 Write a balanced chemical equation for the following reactions ? Use symbols to make equations
    more informative.

    (i) Barium chloride reacts with zinc sulphate forming zinc chloride and precipitates of
    barium sulphate.

    (ii) Aluminium metal displaces manganese in liquid form when heated with manganese
    dioxide.

    Q.7 Consider the following reaction :

    SO2(g) + 2H2S(g)  3S(s) + 2H2O(l)

    (i) Name the substance oxidized

    (ii) Name the oxidising agent.

    (iii) Name the substance reduced.

    (iv) Name the reducing agent.

    Q.8 Gives suitable reason for the following -

    (i) Can a displacement reaction be a redox reaction ?

    (ii) Gold and platinum do not get affected even if there is presence of moist air or acidic
    gases. Why

    (iii) Corrosion of aluminium is considered to be advantageous ?

    Q.9 Classify each of the following reaction as : thermal decomposition, displacement, double
    displacement, electrical decomposition, combination or photo decomposition reaction.

    Concept Coaching Classes


    (i) CaCO3(s)  CaO(s) + CO2(g)

    (ii) 2AgBr(s)  2Ag(s) + Br2(g)

    (iii) 2H2O(l)  2H2(g) + O2(g)

    (iv) Zn(s) + CuSO4(aq)  ZnSO4(aq) + Cu(s)

    (v) Na2SO4(aq) + BaCl2(aq)  BaSO4(s) + 2NaCl(aq)

    (vi) CaO(s) + H2O(l)  Ca(OH)2(aq)

    Q.10 Consider the following chemical equations :

    (i) CuO(s) + H2(g)  Cu(s) + H2O(g)

    (ii) Fe2O3(s) + 3CO(g)  2Fe(l) + 3CO2(g)

    Identify the following in these equations, giving reasons :

    (a) The substance getting oxidised.

    (b) The substance getting reduced

    (c) The oxidising agent

    (d) The reducing agent

    Concept Coaching Classes


    Worksheet-4 (Chemical Reaction)
    Q.1 The following equation represents calcination of lime stone :
    CaCO3(s) CaO (s) + CO2
    The amount of quick lime (CaO) obtained by calcination of 100 g of the lime stone is
    (a) 100g (b) 50 g
    (c) 56g (d) 40g

    Q.2 Which of the following is a combination reaction ?


    (a) CaCO3 + 2HCl CaCl2 + CO2 + H2O
    (b) N2 + 3H2  2NH3
    (c) 2KNO3  2KNO2 + O2
    (d) Zn + H2SO4  Al2O3 + 2Fe

    Q.3 Fe2O3 + 2Al  Al2O3 + 2Fe


    The above reaction is an example of
    (a) combination reaction
    (b) double displacement reaction
    (c) decomposition reaction
    (d) displacement reaction

    Q.4 In the reaction, SO2 + 2H2S  2H2O + S, the reducing agent is


    (a) SO2 (b) H2S
    (c) H2O (d) S

    Q.5 Which of the following is a metathesis reaction


    (a) FeCl3 + 3NaOH  Fe(OH)3 + 3NaCl
    (b) Zn + CuSO4  ZnSO4 + Cu
    (c) 2CO + O2  2CO2
    (d) N2 + O2 2NO

    Q.6 What happens when dilute hydrochloric acid is added to iron fillings ?
    (a) Hydrogen gas and iron chloride are produced
    (b) Chlorine gas and iron hydroxide are produced
    (c) No reaction takes place
    (d) Iron salt and water are produced

    Concept Coaching Classes


    Q.7 In the reaction : Cu + I2 CuI2 the substance undergoing reduction is
    (a) Cu (b) I2
    (c) CuI2 (d) Both A & B

    Q.8 Which of the following reactions is a double displacement reaction ?


    (a) Zn + CuSO4 ZnSO4 + Cu
    (b) NaOH + HCl  NaCl + H2O
    (c) CaCO3 CaO + CO2
    (d) CaO + H2O  Ca(OH)2

    Q.9 When iron nails are added to an aqueous solution of copper sulphate, a chemical change
    occurs. Which of the following is not true about this reaction ?
    (a) Blue colour of the solution in colour
    (b) Iron nails become brownish in colour
    (c) It is a displacement reaction
    (d) Iron nails dissolves completely

    Q.10 When magnesium is burnt in air (indicate which statement is not correct)
    (a) It burns with a brilliant flame
    (b) A white residue is formed
    (c) An endothermic reaction takes place
    (d) A combination reaction takes place

    Concept Coaching Classes

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