Question Pool Reactivity series & Electrochemistry

Reactivity series & Electrochemistry - SAMAGRA Question Pool & Answers | Class 10 English Medium

Kerala Syllabus SAMAGRA SCERT SAMAGRA Question Pool for Class 10 English Medium Chemistry Reactivity series & Electrochemistry

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Qn 1.

Experiments related to displacement reaction are given below

1) A Silver rod is dipped in CuSO4 .

2) A Zinc rod is dipped in CuSO4

In which case does displacement reaction occur .why?



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Qn 2.

On electrolysis of fused sodiumchloride sodium is formed at the cathode and chlorine at the anode

a) Write the equation of reactions occuring at the anode and cathode

b) If aqueous solution of sodium chloride is electrolysed,what will be the product formed at the cathode?



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Qn 3.

Diagram of Galvanic cell is given

a) Which is the anode of thts cell ?

b) Write the equation of the cathode reaction

(Valency of metals : 2)



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Qn 4.

Analyse the given equation and answer the questions.

Zn+ Cu2+SO42- →Zn2+SO42- + CuO

a) Which metal is oxidised?

b) Is the above reaction a redox one. Why?



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Qn 5.

Some observations of the reaction of metals Al, Na ,Fe, Cu with water are given

1. One metal reacted with cold water to form an alkali and a gas

2. Another metal reacted only with steam to form a gas.

a) Which is the gas formed when metals react with water?

b) Which of the above metals give  the observations 1 and 2?

c) Write the equation of the reaction which gave the first observation.



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Qn 6.

The decreasing order of reactivity of some metals are given

Mg>Al>Zn>Fe>Cu>Au

a) Name any one metal that cannot displace hydrogen from dil. HCl?

b) Which metal reacts only with steam to displace hydrogen from water?

c) Which metal can displace all other metals from their salt solutions?



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Qn 7.

A newly cut surface of sodium and a rubbed surface of zinc appears shiny

a) Which of the above loses its lustre easily?

b) Write the equation of any one reaction which causes loosing of its lustre

c)  Compare  the the reactivity of the two metals?



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Qn 8.

cell

Positive electrode

Negative electrode

Galvanic cell

Cathode

(a)

...............................

Electrolytic cell

(b)

................................

(c)

................................



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Qn 9.

Zn + CuSO4 → ZnSO4 + Cu

a)Write down the equation of oxidation reaction

b) Is it a redox reaction? why?



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Qn 10.

A Zinc rod is dipped in CuSO4 solution. What happens to the colour of the solution? Explain with the help of equation showing the reaction taking place in the test tube



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Qn 11.

  

                               A

                               B

a)Two type of cells are represented in figure A and B.What are they?

b) What is the energy change taking place in the cell B ?

c) Which is the positive electrode in B ??



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Qn 12.

NaCl crystals, sugar, moltenNaCl ,aqueous solution of NaCl are given.

Which of the above conduct electricity ?why?



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Qn 13.

Electricity is passed through molten sodiumchloride and sodiumchloride solution

a)  Compare the reactions taking place at each electrodes and complete the table

Electrolyte

Positive electrode

Negative electrode

Molten sodiumchloride

Cl2

(a)

.....................

sodiumchloride solution

(b)

................................

H2

 

b) Write equation of the reaction taking place at the positive electrode if molten KCl is used instead of molten NaCl?



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Qn 14.

Correct the given wrong statements, if any

a) In a Gavanic cell electrical energy is converted to chemical energy

b) The reactivity of cathode in a galvanic cell will be less than that of the anode

c) In a Gavanic cell electrons flow from cathode to anode

d) Oxidation take place at anode



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Qn 15.

Three metal pieces are dipped in water taken in three test tubes .Adrop of phenolphthalein is added to each test tube

a) Which metal forms pink colour on reaction with cold water?

b) Which metal gives pink colour only on heating ?

c) Write the balanced equation for the reaction taking place in any one test tube.



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Qn 16.

Name the product formed at the cathode on electrolysis of molten KCl ?



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Qn 17.
  • The element A generally show +1 oxidation state If we electrolyse molten chloride of this element

    a) What is the energy change taking place in an electrolytic cell? 

  • c) Name the product formed at the positive electrode?

  • b) Write down the equation showing the oxidation reaction



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Qn 18.

A piece of magnesium ribbon is dipped in CuSO4 solution. After some time Cu is found to get deposited on the ribbon

a) Write oxidation reaction taking place here?

b)Write the equation showing the redox reaction taking place in the test tube?

c)If a Ag rod is dipped instead of Mg ribbon,does any change in colour occur to the solution.why?

 



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Qn 19.


Figure of an electrolytic cell is given

a) Which is the product obtained at the cathode?

b) Write the equation of the chemical reaction taking place at anode

c) Write any two instances where electrolysis is made use of.



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Qn 20.


Figure of an electrolytic cell is given

a) Write the equation of the reduction reaction take place in the cell

b) If the flow of electrons in Mg-Zn cell is in opposite direction as that of Zn-Fe cell shown above, arrange the metals Zn,Mg,Fe in the ascending order of their reactivity



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Qn 21.

Equation of the reaction of iron rod and CuSOsolution is given below.

CuSO4 + Fe →FeSO4 + Cu

a) Write the eqation showing the reduction reaction taking place here.

b) Will displacement reaction take place by using ZnSO4 instead of CuSO4 ?Give reason



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Qn 22.

Some metals are arranged in the decreasing order of their reactivity.

Mg>Zn>Pb>Cu>Ag

a) Which will be the anode of Zn- Cu Galvanic cell ?

b) Write the equation of the redox reaction taking place in the above cell?



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Qn 23.

Which is the product formed at cathode on electrolysis of molten NaCl?



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Qn 24.
  • Analysis the following reactions and answer the following questions.

    (Hint : Order of reactivity Mg>Zn>Fe>Cu)

    Activity 1 : A copper rod is dipped in FeSO4 solution

    Activity 2 : A Zinc rod is dipped in FeSO4 solution

 

a) In which test tube does displacement reaction take place ?

b) Write the redox reaction taking place here



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Qn 25.

The equation of the redox reaction taking place in a Galvanic cell is given below.

Cu + 2Ag+ →Cu2+ + 2Ag

a) Write the equation showing the reduction reaction

b)Draw the figure of the Galvanic cell



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Qn 26.


Observe the figure

 

     (A )                          ( B)

 

(Hint:Order of reactivity Na>Mg>Zn>Fe>Cu)

a) The Fe rod dipped in which beaker shows a change in colour?

b) Write the equation for the oxidation reaction taking place



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Qn 27.

Zn, Cu,Ag  rods and solutions of AgNO3 , CuSOZnSO4 and MgSO4 are given . How many Galvanic cells can be constructed from this? Complete the table.

(Mg>Zn>Fe>Cu)

cell

Anode

Cathode

Zn-Cu

Zn

Cu

 

 

 

 

 

 

 

  • Answer)

    Three types

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    Qn 28.


    Some electrodes and salt solutions are shown.

    a) Which is the Galvanic cell that can be constructed from the above?

    b) What are the anode and cathode of the cell?

    c) Write equaton of the reaction that takes place at anode ?



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    Qn 29.

    The diagram of a galvanic cell is given

    a) What are the anode and cathode of the cell

    b) Write the equation of the cathodic reaction

    c) Write the eqation of the redox reaction taking place in the cell



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    Qn 30.

    Reaction of some metals with water is given in the table( symbols are not real)

    Metal

    Reaction

    A

    Reaction with steam

    B

    Does not react

    C

    Reacts vigourously even with cold water

    D

    React with hot water

     

    a)Based on the above reaction ,aarrange the given metals in the decreasing order of their reactivity

    b)If a galvanic cell is constructed using A and B as electrodes, which is the anode???

    c) Write the equation of the reaction taking place at electrode B of the cell

    (valency of B=2)



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Qn 31.

Sodium vigourously reacts with cold water

a) Which is the gas formed in the reaction?

b) Write the balanced chemical eqation of the reaction

c) If two drops of phenolphthalein are added to the test tube ,what can you observe?



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Qn 32.

Which among the given metals does not react with dilute acids ?

(Sodium, Copper, Magnesium, Lead)



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Qn 33.

Electricity is passed through sodium chloride solution taken in a beaker.

a) Which is the substance formed at the cathode?

b)Which substance gets discharged at the anode?

c) The reaction taking place at one electrode is
2H2O + 2e- → H2 + 2OH-
At which electrode this reaction takes place?

d) What will be the nature of the solution after electrolysis?

(Acidic / Neutral‍ / Alkaline‍)



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Qn 34.


Observe the cell given below.