Kerala SCERT Class 10 Chemistry Chapter 3 Reactivity Series and Electrochemistry Question Answer Solution Here. Kerala Board Class 10 Students can find Here 3rd Chapter Reactivity Series and Electrochemistry Notes provide by our Teacher. Important Question Answer from Chapter 3 Reactivity Series and Electrochemistry.
- Board- Kerala Board.
- Class – 10.
- Subject – Chemistry Part 1
- Chapter – 3
- Chapter Name – Reactivity Series and Electrochemistry.
- Topic – Question Answer Solution.
Q.1} MCQ
1) What is the product of following reaction.
Mg + O2 ————.
a) Magnesium dioxide
b)Magnesium oxide
c) Magnesium
d) None of the above
2) Zn + CuSO4 ZnSO4 + Cu
Identify the type of chemical reaction.
a) Combination reaction
b) Displacement reaction
c) Double-displacement reaction
d) Oxidation reaction
3) Which of the following salt is used in salt bridge.
a) NaCl
b) KCl
c) MgSO4
d) CuSO4
4) Electrode at which oxidation takes place is —-
a) Cathode
b) Anode
c) Positive electrode
d) none of the above
5) Positive ions are called ————
a) anions
b) radon
c) cation
d) electron
6) Which metal is recovered from Silver nitrate solution
a) Ag
b) Au
c) Na
d) K
7) Negative ions are called ———
a) anions
b) cation
c) radon
d) neutron
8) In which cell chemical energy is converted into electrical energy.
a) primary cell
b) secondary cell
c) voltaic cell
d) none of the above
Q.2) Very short answer questions.
1.) Define galvanic cell .
2.) What Is salt bridge?
3.) What are the electrolytes?
4.) What are the cations and anions.
5.) What is electroplating?
6.) Give two examples of electroplating?
Q.3) Short answer question
1.) From the following figure answer the question.
a.) Which metal is connected to the negative terminal
b.) which metal is connected to the positive terminal
c.) which solution is used as the electrolyte.
2.) Give the use of salt bridge.
3.) What is reactivity series?
4.) By considering the process of electrolysis of molten sodium chloride , give the answers of following.
a.) Which ion is attracted towards anode.
b.) what is the chemical reaction taking place there?
Q.4.) Long answer questions
1.) What is electroplating and give its examples?
2.) What is galvanic cell and Give the chemical reactions observed in galvanic cell .
3.) Answer the following
2AgNO3 + CU → Cu(NO3)2 + 2Ag
a.) which metal was oxidized in this case? Give reaction
b.) which metal was reduced in this case? Give reaction
c.) what is the type of above reaction?
d.) why one metal is oxidized or reduced over the other ?
ANSWER SHEET
Reactivity Series and Electrochemistry
Q.1) MCQ
a) Magnesium dioxide
b) Displacement reaction
c) KCl
b) anode
c) cation
a) Ag
a) anions
c) voltaic cell
Q.2) Very short answers.
1.) Galvanic cell is an arrangement in which chemical energy is converted into electrical energy by means of a redox reaction.
2.) Salt bridge is U- tube filled with a paste made by mixing gelatine or agar agar gel and a salt like KCl, KNO3 or NH4
3.) Electrolytes are substances which conduct electricity in molten states or in aqueous solutions and undergo chemical change.
4.) The positive ions which are attracted towards the negative electrode are called cations
The negative ions which are attracted towards anode are called anions.
5.) The process of obtaining a coting of one metal over another metal using electrolysis is known as Electroplating.
6.) i) Copper plating on Iron Bangle
ii)Gold plated Jewelry
iii)Silver plated Utensils
Q.3) Short answer questions.
1)
a) Iron
b) Copper
c) Copper sulphate solution.
2) Salt bridge completes the circuit by transfer of ions and maintains the electrical neutrality of the cell.
3) The series obtained by arranging some of the metals in the decreasing order of their reactivity is called reactivity series.
4)
a) chlorine ion
b) dissociation reaction.
Q.4) Long answer question.
1) The process of obtaining a coating of one metal over the other using electrolysis is known as electroplating. This thin coating is helpful for improving the appearance of metal and it prevents metallic corrosion.
Examples :-
- gold plated jwellery.
- silver plated utensils.
- chromium plated handle bars.
2) Galvanic cell is also called voltaic cell in which chemical energy is converted into electrical energy by means of redox reaction.
In galvanic cell Zn rod is dipped in ZnSO4 solution and Cu rod is dipped in CuSO4 solution. The reaction takes place is
As follows:-
Zn →Zn2+ + 2e– (at Zn electrode, oxidation takes place )
Cu2+ + 2e– → Cu (at Cu electrode, reduction takes place)
3)
a) Copper is get oxidized and reaction is
Cu → Cu(NO3)2 + 2e–
b) Silver is get reduced and reaction is
AgNO3+ 2e– → Ag
c) Redox reaction
d) Metals having high reactivity displace the metals having less reactivity from their salt solution. This reactions are called displacement reactions. Metals having high reactivity get oxidized and with lesser reactivity get reduced.
