Metals and Non-metals Part 2: MCQs (Q26–Q50)

🔩 Metals and Non-Metals – Class 10 Science MCQs

Part 2: Reactivity Series, Extraction of Metals & Related Reactions (Q26–Q50)

Q26. Which metal is the most reactive in the reactivity series?

A. Sodium
B. Calcium
C. Potassium
D. Aluminium

✅ Correct Answer: C. Potassium

Explanation: Potassium is highly reactive, reacts explosively with water.

Q27. Which of the following is the least reactive metal?

A. Copper
B. Gold
C. Silver
D. Zinc

✅ Correct Answer: B. Gold

Q28. The order of reactivity of metals is known as:

A. Activity chart
B. Reactivity series
C. Metal arrangement list
D. Electrochemical series

✅ Correct Answer: B. Reactivity series

Q29. Which of these metals reacts with cold water?

A. Magnesium
B. Zinc
C. Calcium
D. Iron

✅ Correct Answer: C. Calcium

Explanation: Ca + H₂O → Ca(OH)₂ + H₂.

Q30. Which metal reacts with steam but not with cold water?

A. Zinc
B. Calcium
C. Sodium
D. Potassium

✅ Correct Answer: A. Zinc

Q31. Which metal does not react even with steam?

A. Zinc
B. Iron
C. Copper
D. Aluminium

✅ Correct Answer: C. Copper

Q32. Which gas is released when metals react with acids?

A. CO₂
B. O₂
C. H₂
D. N₂

✅ Correct Answer: C. H₂ (Hydrogen gas)

Q33. What is the principle behind metal extraction from ores?

A. Electrolysis only
B. Difference in reactivity of metals
C. Only physical separation
D. Cooling and condensation

✅ Correct Answer: B. Difference in reactivity of metals

Q34. Which process is used to extract highly reactive metals like sodium, potassium, and calcium?

A. Roasting
B. Calcination
C. Electrolysis of molten salts
D. Reduction with carbon

✅ Correct Answer: C. Electrolysis of molten salts

Q35. Which process is used to extract moderately reactive metals like zinc, iron, and lead?

A. Reduction with carbon
B. Electrolysis
C. Alloying
D. Distillation

✅ Correct Answer: A. Reduction with carbon

Q36. Which process is used for extraction of less reactive metals like copper, mercury, silver?

A. Roasting or heating alone
B. Electrolysis
C. Reduction with hydrogen
D. Calcination only

✅ Correct Answer: A. Roasting or heating alone

Q37. Roasting is heating sulphide ores in the presence of:

A. Hydrogen
B. Oxygen
C. Steam
D. Nitrogen

✅ Correct Answer: B. Oxygen

Explanation: Example: 2ZnS + 3O₂ → 2ZnO + 2SO₂.

Q38. Calcination is heating carbonate ores in:

A. Presence of oxygen
B. Absence of oxygen
C. Presence of nitrogen
D. Presence of steam

✅ Correct Answer: B. Absence of oxygen

Explanation: Example: CaCO₃ → CaO + CO₂.

Q39. Which is obtained by calcination of ZnCO₃?

A. ZnO
B. Zn
C. ZnS
D. ZnCl₂

✅ Correct Answer: A. ZnO

Q40. Which of the following metals is obtained by electrolytic reduction of molten Al₂O₃?

A. Iron
B. Copper
C. Aluminium
D. Zinc

✅ Correct Answer: C. Aluminium

Q41. Which electrolyte is used in the extraction of aluminium?

A. Molten NaCl
B. Molten Al₂O₃ dissolved in cryolite
C. NaOH solution
D. Dilute HCl

✅ Correct Answer: B. Molten Al₂O₃ dissolved in cryolite

Explanation: Cryolite lowers the melting point and increases conductivity.

Q42. Which gas is released at the anode during electrolysis of molten Al₂O₃?

A. Oxygen
B. Hydrogen
C. Chlorine
D. Carbon dioxide

✅ Correct Answer: A. Oxygen

Q43. Which of the following is a reducing agent in metal extraction?

A. CO
B. C (Carbon)
C. H₂
D. All of these

✅ Correct Answer: D. All of these

Q44. The process of coating iron with zinc to prevent rusting is called:

A. Alloying
B. Galvanization
C. Electroplating
D. Refining

✅ Correct Answer: B. Galvanization

Q45. Which method is used for refining metals like copper?

A. Distillation
B. Electrolytic refining
C. Roasting
D. Calcination

✅ Correct Answer: B. Electrolytic refining

Q46. In electrolytic refining of copper, the impure copper is made:

A. Anode
B. Cathode
C. Electrolyte
D. Both anode and cathode

✅ Correct Answer: A. Anode

Q47. In electrolytic refining, pure copper is obtained at:

A. Anode
B. Cathode
C. Electrolyte
D. None

✅ Correct Answer: B. Cathode

Q48. In electrolytic refining of copper, the electrolyte used is:

A. CuSO₄ solution with H₂SO₄
B. NaCl solution
C. HCl solution
D. Molten copper oxide

✅ Correct Answer: A. CuSO₄ solution with H₂SO₄

Q49. The impurities that settle down below the anode during electrolytic refining are called:

A. Electrolyte
B. Slag
C. Anode mud
D. Ore

✅ Correct Answer: C. Anode mud

Q50. Which one of the following is extracted by electrolytic reduction?

A. Iron
B. Copper
C. Aluminium
D. Lead