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Class 10 Chemistry Chapter 16 Electrochemistry Test 3 – 2027

Chemistry 10th Class Chapter 16 Class Test 3

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Prepare for your matric exams with the Class 10 Chemistry Chapter 16 Electrochemistry Class Test 3, designed for practice according to the Punjab Board 2027 Model Papers. This test helps students revise important concepts, practise exam-style questions, and improve their understanding of Electrochemistry in Class 10 Chemistry. Students can use this Chapter 16 Chemistry Test 3 for self-assessment, classroom practice, and board examination preparation. Explore more Class 10 Chemistry Model Papers 2027 and chapter-wise tests to strengthen your preparation for the Punjab Board matric examinations.

786Times Up-to-Date Papers
PECTAA NEW SYLLABUS
Chemistry — 10
Chapter: 16
Total Time: 35 min

CHAPTER WISE CLASS TEST

(Test # 3)

Chemistry
Total Marks: 25
ABCD
1ABCD
2ABCD
3ABCD
ABCD
4ABCD
5ABCD
6ABCD
ABCD
7ABCD
8ABCD
NOTE: Four possible answers A, B, C and D to each question are given. The choice which you think is correct, fill that circle in front of that question with Marker or Pen ink. Cutting or filling two or more circles will result in zero mark in that question.
TIME: 10 MinOBJECTIVEMARKS: 8
Q.1:(08)
1.
The oxidation number of Mn in K2MnO4:
(A) +7 (B) +5 (C) +6 (D) −6
Answer: C (+6)
2.
The formula of potassium permanganate is:
(A) K2MnO4 (B) KMnO4 (C) KMnO2 (D) K2MnO2
Answer: B (KMnO4)
3.
Which element in the following reaction is being reduced?
4HBr(aq) + MnO2 (s) → MnBr2 (aq) + Br2 (g) + 2H2O(l)
(A) Br (B) Mn (C) H (D) Both Mn and H
Answer: B (Mn: +4 → +2)
4.
Oxidation is defined as a process in which :
(A) Oxygen is removed (B) Oxygen is added (C) Hydrogen is added (D) Both hydrogen and oxygen are added
Answer: B
5.
During electrolysis of dilute solution of H2SO4, using Pt electrodes, which process takes place at the cathode?
(A) Reduction (B) Neither oxidation nor reduction (C) Oxidation (D) First oxidation and then reduction
Answer: A
6.
The electrolyte present in the electrolytic cell is in the form of:
(A) Fixed ions (B) Freely moving ions (C) Neutral atoms (D) Covalent molecules
Answer: B
7.
Which product you will get at the anode when an aqueous solution of CuSO4 is electrolysed using copper electrodes?
(A) Cu (B) O2 (C) H2 (D) Cℓ2 (D) No product, instead copper metal will go into the solution as Cu2+.
Answer: (D) No product; Cu → Cu2+ + 2e−
8.
During electrolysis of brine,the by product formed is:
(A) Hydrochloric acid (B) Sodium hydroxide solution (C) Sodium carbonate (D) Sodium sulphate
Answer: B
TIME: 25 MinSUBJECTIVEMARKS: 17

(PART – I)

Q.2   Write short answers to following questions.(6×2=12)
i.
What happens when electricity is passed through an aqueous solution of NaCl?
Answer NaCl solution (brine) is electrolysed. Hydrogen gas is released at the cathode and chlorine gas at the anode, while sodium hydroxide (NaOH) solution is left in the cell.
  • Cathode: 2H+ + 2e− → H2 (g)
  • Anode: 2Cl− → Cl2 (g) + 2e−
ii.
What is the oxidation number of hydrogen in different compounds?
Answer
  • +1 in most compounds (e.g. HCl, H2O).
  • −1 in metal hydrides (e.g. NaH, CaH2).
  • 0 in hydrogen molecule (H2).
iii.
What are the main objectives of electroplating?
Answer
  • To protect a metal from corrosion (rusting).
  • To give the object an attractive, shiny appearance.
  • To increase the hardness, thickness and wear resistance of the surface.
iv.
Define oxidation and reduction in terms of oxidation number.
Answer Oxidation: a process in which the oxidation number of an element increases.
Reduction: a process in which the oxidation number of an element decreases.
v.
How does an electrolyte conduct electricity?
Answer In the molten state or in aqueous solution, an electrolyte has freely moving ions. When a voltage is applied, positive ions move to the cathode and negative ions move to the anode, so the electric current is carried through the electrolyte by these ions.
vi.
Which ions are present in the brine solution?
Answer Na+ and Cl− (from NaCl), and H+ and OH− (from water).

(PART – II)

Note: Attempt the following question.
Q.3:  Define electrolysis. How does the process of electrolysis take place?(5)
Answer Definition: Electrolysis is the process in which an electric current is passed through a molten or aqueous electrolyte, causing it to decompose chemically.

Process:
  • Two inert electrodes (e.g. Pt or graphite) are dipped in the electrolyte and connected to a battery. The electrode joined to the positive terminal is the anode; the one joined to the negative terminal is the cathode.
  • The electrolyte contains freely moving ions. Positive ions (cations) move to the cathode and gain electrons (reduction).
  • Negative ions (anions) move to the anode and lose electrons (oxidation).
  • The electrons released at the anode travel through the external circuit to the cathode, so the circuit is completed.
Example (molten NaCl):
Cathode: Na+ + e− → Na(l)
Anode: 2Cl− → Cl2 (g) + 2e−
786Times • 786Times Up-to-Date Papers • Chemistry — 10 • Chapter 16

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)

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