Lakshesh Verma Lakshesh Verma

Lecture 3 : Precipitation, Neutralization, Oxidation and Reduction Reactions & Corrosion and Rancidity

  • Chemical Reactions and Equations Assignments 1

    State the type of chemical reactions with chemical equations that take place in the following.

    (i)   Magnesium wire is burnt in air.

    (ii)   Electric current is passed through water.

    (iii)  Ammonia and hydrogen chloride gases are mixed

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  • Chemical Reactions and Equations Assignments 2

    State one example each characterised by the following along with the chemical equation:

    (i) Change in state

    (ii) Evolution of gas

    (iii) Change in temperature

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  • Chemical Reactions and Equations Assignments 3

    Which of the statements about the reaction below are incorrect?

    (a) Lead is getting reduced.

    (b) Carbon dioxide is getting oxidised.

    (c) Carbon is getting oxidised.

    (d) Lead oxide is getting reduced.

    (i) (a) and (b)

    (ii) (a) and (c)

    (iii) (a), (b) and (c)

    (iv) all

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  • Chemical Reactions and Equations Assignments 4

    A water insoluble substance ‗X‘  on reacting with dilute H2SO4  released a colourless and odourless gas accompanied by brisk effervescence. When the gas was passed through water,the solution obtained turned blue litmus red. On bubbling the gas through lime water, it initially  became  milky  and  milkyness  disappeared  when  the  gas  was  passed  in  excess.Identify the substance ‗X‘. Write its chemical equations of the reactions involved.

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  • Chemical Reactions and Equations Assignments 5

    Name one metal which does not corroded?

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  • Chemical Reactions and Equations Assignments 6

    What “aq” stands for?

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  • Chemical Reactions and Equations Assignments 7

    What do you mean by Rancidity?

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  • Chemical Reactions and Equations Assignments 8

    The substance oxidized in a redox reaction is called……………………… agent.

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  • Chemical Reactions and Equations Assignments 9

    Why Hydrogen Peroxide kept in colored bottles?

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  • Chemical Reactions and Equations Assignments 10

    What is an oxidizing agent?

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  • Chemical Reactions and Equations Assignments 11

    Can we place silver nitrates solution in an iron vessel? Why or Why not?

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  • Chemical Reactions and Equations Assignments 12

    Suggest two methods to prevent rancidity?

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  • Chemical Reactions and Equations Assignments 13

    In the following reaction:

    MnO2 + 4HCl→ MnCl2 +2H2O+Cl2

           a) Name the substance oxidized.                                                                                    

           b) Name the substance reduced.

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  • Chemical Reactions and Equations Assignments 14

    (a) Why is combustion reaction an oxidation reaction?

    (b) How will you test whether the evolved in a reaction is hydrogen?

            (c) Why does silver not evolve hydrogen gas on reacting with dilute sulphuricacid

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  • Chemical Reactions and Equations Assignments 15

    On what basic Reaction is black and white photography based?

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  • Chemical Reactions and Equations Assignments 16

    Name the substance Oxidized and Reduced in the Chemical Reaction

    MnO₂ + 4HCl → MnCl₂ +Cl₂ +2H₂O

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  • Chemical Reactions and Equations Assignments 17

    Why do potato chips manufacturers fill the packets with nitrogen gas?

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  • Chemical Reactions and Equations Assignments 18

    Astha has been collecting silver coins and copper coins. One day she observed a black coating on silver coins and a green coating on copper coins. Which chemical phenomenon is responsible for these coatings? Write the chemical name of black and green coatings Test Tube CuSO4 Solution Iron Nail

    Thread

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  • Chemical Reactions and Equations Assignments 19

     

    Explain the following terms with one example each.

    (a) Corrosion

    (b) Rancidity

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  • Chemical Reactions and Equations Assignments 20

    Oil and fat containing food items are flushed with nitrogen. Why?

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  • Chemical Reactions and Equations Assignments 21

     

    Why do we apply paint on iron articles?

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  • Chemical Reactions and Equations Assignments 22

      

    Explain the following in terms of gain or loss of oxygen with two examples each.

    (a) Oxidation

    (b) Reduction

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  • Chemical Reactions and Equations Assignments 23

      What do you mean by a precipitation reaction? Explain by giving examples.

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  • Chemical Reactions and Equations Assignments 24

      

    Identify the substances that are oxidised and the substances that are reduced in the following reactions.

    (i)

    (ii) 

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    • Description:-

    Lecture 3:

    Today,we will discuss the last two topics of the chapter, i.e;  Precipitation, Neutralization, Oxidation and Reduction Reactions & Corrosion and Rancidity respectively of Chapter 1 Chemical Reactions and Equations.

    OBJECTIVES:

    1. Concept about oxidation and reduction processes.

    2. Identify the reaction that undergoes oxidation and reduction processes.

    Important Tip:  

    Please go through the topic, their notes.Properly do the assignments, watch videos of the concerned topics.If you have any doubt about any topic/point please submit it in the discussion section... it will be answered as soon as possible.

    Now ...you can attempt quiz given of this chapter to check your concept clearance about the chapter.

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