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Class 10 Chemistry Chapter 16 Electrochemistry Test 2 – 2027

Grade 10 chemistry Chapter 18 Electrochemistry

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Prepare for your matric board examinations with the Class 10 Chemistry Chapter 16 Electrochemistry Class Test 2, part of the Punjab Board 2027 Model Papers. This Class 10 Chemistry test is designed to help students revise the important concepts of Electrochemistry, practise chapter-related questions, and strengthen their exam preparation according to the Punjab Board syllabus. Students can use this Electrochemistry Chapter 16 Test 2 for revision, self-assessment, and practice for the 10th Class Chemistry examination under the Punjab Board 2027 Model Papers series.

CHEMISTRYCHAPTER-16 (OBJECTIVE)CLASS TEST-2
TIME: 10 MINTOTAL MARKS:30MARKS: 10

1. In HCl, the oxidation number of hydrogen is:

A. −1B. 0C. +1D. +2

2. The charge on permanganate ion (MnO4) is:

A. −2B. −3C. −1D. +1

3. The formula of aluminum sulphate is:

A. AlSO4B. Al2SO4C. Al(SO4)2D. Al2(SO4)3

4. Rusting of iron is an example of:

A. ReductionB. NeutralizationC. OxidationD. Decomposition

5. During electrolysis of brine, the gas produced at the cathode is:

A. OxygenB. ChlorineC. HydrogenD. Nitrogen

6. The temperature required to melt lead(II) chloride is approximately:

A. 100 °CB. 250 °CC. 501 °CD. 700 °C

7. Condition essential for rusting is :

A. Oxygen and nitrogenB. Water and carbon dioxideC. Oxygen and waterD. Sulfur and hydrogen

8. The metal to be deposited is made:

A. CathodeB. AnodeC. ElectrolyteD. Tank

9. Standard reduction potential of copper ion is:

A. +0.34B. −0.34C. +0.76D. +1.10

10. The series of metals arranged according to their tendency to lose electrons is called:

A. Reactivity seriesB. Electrochemical seriesC. Periodic tableD. Oxidation series
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CHEMISTRYCHAPTER-16 (SUBJECTIVE)CLASS TEST-2
TIME: 22 MINMARKS: 20

Attempt any 10 Questions.

i. Define oxidation number.

Ans: The apparent charge an atom would have in a compound if all shared electrons were assigned to the more electronegative atom.

ii. Find out the oxidation number of sulphur in sulphate (SO4−2)

Ans: Let S = x. x + 4(−2) = −2 ⇒ x − 8 = −2 ⇒ x = +6

iii. How can the chemical formula of a compound be written?

Ans: Write the symbols of the elements (positive ion first), write their charges/valencies, cross them over as subscripts and reduce to the simplest ratio. Example: Al+3 and SO4−2 → Al2(SO4)3

iv. Write the formula of aluminum sulphate.

Ans: Al2(SO4)3

v. Define oxidation in terms of oxygen and hydrogen. Give any example.

Ans: Oxidation is the gain of oxygen or the loss of hydrogen. Example: 2Mg + O2 → 2MgO

vi. What is a redox reaction?

Ans: A reaction in which oxidation and reduction occur at the same time. Example: Zn + Cu+2 → Zn+2 + Cu

vii. Define anode and cathode .

Ans: Anode: the electrode where oxidation takes place. Cathode: the electrode where reduction takes place.

viii. What happens if a metal is below hydrogen in the electrochemical series? Give example.

Ans: It cannot displace hydrogen from dilute acids. Example: Cu, Ag and Au do not react with dilute HCl.

ix. Write the reaction of cathode and anode with inert electrodes.

Ans: Molten NaCl with inert electrodes. Cathode: Na+ + e− → Na. Anode: 2Cl− → Cl2 + 2e−

x. Write two advantages of fuel cells over fossil fuels.

Ans: (1) Pollution free; the product is water. (2) Higher efficiency and continuous electricity while fuel is supplied.

xi. What is corrosion?

Ans: The gradual destruction of a metal by chemical or electrochemical reaction with its environment. Example: rusting of iron.

xii. Write the name of methods to prevent corrosion.

Ans: Painting, oiling/greasing, galvanizing, electroplating, alloying and cathodic protection.

xiii. What is electroplating?

Ans: Depositing a thin layer of one metal on another by passing electric current through an electrolyte.

xiv. Write the properties of good electrolyte.

Ans: (1) Dissolves easily and gives free ions. (2) Good conductor in solution/molten state. (3) Does not react with the electrodes.

xv. What are half-cells in a Daniel cell?

Ans: Zn rod in ZnSO4 solution (oxidation, anode) and Cu rod in CuSO4 solution (reduction, cathode), joined by a salt bridge.
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Class 10 Chemistry Chapter wise Test Series 2027

Chapter No. 16 : Electrochemistry  (with complete Solutions)

Test No. 1  Marks: 30 ( Full Unit Class Test)

Test No. 2  Marks: 30 ( Full Unit Class Test)

Test No. 3  Marks: 25 ( Full Unit Class Test)

Test No. 4  Marks: 25 ( Full Unit Class Test)

Test No. 5  Marks: 25 ( Topic No. 16.1 to 16.9 Test)

Test No. 6  Marks: 25 ( Topic No. 16.10 to 16.17 Test)

Test No. 7 Mark: 60 ( Full Unit with exercise Class Test)

Test No. 8 Marks: ( Full Unit Test Model Paper 2)

Click to choose another chapter

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