General Principles and Processes of Isolation of Elements MCQs with answers

Dear candidates you will find MCQ questions of 12th Class - Chemistry | Chapter: General Principles and Processes of Isolation of Elements here. Learn these questions and prepare yourself for coming examinations. You can check the right answer of any question by clicking the option or by clicking view answer button.
All subjects and chapters of 12th Class are listed below. You can select any subject and chapter below to learn mcq questions of that chapter and subject.

Q. Which of the following ore is best concentrated by froth floatation process?
  • (A) Magnetic
  • (B) Siderite
  • (C) Galena
  • (D) Malachite
💬 Discuss
✅ Correct Answer: (C) Galena
Q. Extraction of gold and silver involves leaching with CN-. Silver is later recovered by
  • (A) Distillation
  • (B) Zone refining
  • (C) Displacement by Zn
  • (D) Liquation
💬 Discuss
✅ Correct Answer: (C) Displacement by Zn
Q. Which one of the following ore is concentrated by chemical leaching method?
  • (A) Galena
  • (B) Copper pyrites
  • (C) Cinnabar
  • (D) Argentite
💬 Discuss
✅ Correct Answer: (D) Argentite
Q. According to Ellingham diagram, the oxidation reaction of carbon to carbon monoxide may be used to reduce which one of the following at lowest temperature?
  • (A) Al2O3
  • (B) Cu2O
  • (C) MgO
  • (D) ZnO
💬 Discuss
✅ Correct Answer: (B) Cu2O
Q. The first step in extraction of copper from CuFeS2 is
  • (A) reduction by carbon
  • (B) electrolysis of ore
  • (C) roasting in O2
  • (D) magnetic separation
💬 Discuss
✅ Correct Answer: (C) roasting in O2
Q. Roasted copper pyrites on smelting with sand produces
  • (A) FeSiO3 and Cu2S
  • (B) CaSiO2 and Cu2O
  • (C) Ca3(PO4)2 and Cu2S
  • (D) Fe3(PO4)2 and Cu2S
💬 Discuss
✅ Correct Answer: (A) FeSiO3 and Cu2S
Q. The composition of copper matte is
  • (A) Cu2S + FeS
  • (B) Cu2S + Cu2O
  • (C) Cu2S + FeO
  • (D) Cu2O + FeS
💬 Discuss
✅ Correct Answer: (A) Cu2S + FeS
Q. A number of elements are available in earth’s crust but most abundant elements are ___________ .
  • (A) Al and Fe
  • (B) Al and Cu
  • (C) Fe and Cu
  • (D) Cu and Ag
💬 Discuss
✅ Correct Answer: (A) Al and Fe
Q. In the extraction of chlorine by electrolysis of brine ___________ .
  • (A) oxidation of Cl– ion to chlorine gas occurs.
  • (B) reduction of Cl– ion to chlorine gas occurs.
  • (C) For overall reaction ∆G° has negative value.
  • (D) a displacement reaction takes place.
💬 Discuss
✅ Correct Answer: (A) oxidation of Cl– ion to chlorine gas occurs.
Q. Which of the following reactions is an example of auto reduction?
  • (A) Fe3O4 + 4CO → 3Fe + 4CO2
  • (B) Cu2O + C → 2Cu + CO
  • (C) Cu2+ (aq) + Fe (s) → Cu (s) + Fe2+ (aq)
  • (D) Cu20 + \(\frac{1}{2}\)Cu2S → 3Cu + \(\frac{1}{2}\) SO2
💬 Discuss
✅ Correct Answer: (D) Cu20 + \(\frac{1}{2}\)Cu2S → 3Cu + \(\frac{1}{2}\) SO2
Q. The electrolytic reduction technique is used in the extraction of
  • (A) Highly electronegative elements.
  • (B) Highly electropostive elements.
  • (C) Metalloids
  • (D) Transition metals.
💬 Discuss
✅ Correct Answer: (B) Highly electropostive elements.
Q. Which ore can be best concentrated by froth floatation process?
  • (A) Malachite
  • (B) Cassiterite
  • (C) Galena
  • (D) Magnetite
💬 Discuss
✅ Correct Answer: (C) Galena
Q. Bessemer converter is used in the manufacture of
  • (A) Pig iron
  • (B) Steel
  • (C) Wrought iron
  • (D) Cast iron
💬 Discuss
✅ Correct Answer: (B) Steel
Q. The method of zone refining of metals is based on the principle of
  • (A) greater mobility of the pure metal than that of the impurity.
  • (B) higher melting point of the impurity than that of the pure metal.
  • (C) greater noble character of the solid metal than that of impurity.
  • (D) greater solubility of the impurity in the molten state than in the solid.
💬 Discuss
✅ Correct Answer: (D) greater solubility of the impurity in the molten state than in the solid.
Q. Purest form of iron is
  • (A) Cast iron
  • (B) Hard Steel
  • (C) Wrought iron
  • (D) Stainless steel
💬 Discuss
✅ Correct Answer: (C) Wrought iron
Q. Consider the following reaction at 1000° C and Choose the correct statement at 1000°C
  • (A) Zinc can be oxidised by carbon monoxide.
  • (B) Zinc oxide can be reduced by graphite.
  • (C) Both statements A and B are correct.
  • (D) Both statements A and B are false.
💬 Discuss
✅ Correct Answer: (B) Zinc oxide can be reduced by graphite.

12th Class mcqs download, 12th Class mcqs pdf free download, 12th Class free pdf download, 12th Class mcq questions, 12th Class ncert book pdf download,

Table of contents

  1. Which of the following ore is best concentrated by froth floatation process?
  2. Extraction of gold and silver involves leaching with CN-. Silver is later recovered by
  3. Which one of the following ore is concentrated by chemical leaching method?
  4. According to Ellingham diagram, the oxidation reaction of carbon to carbon monoxide may be used to r
  5. The first step in extraction of copper from CuFeS2 is
  6. Roasted copper pyrites on smelting with sand produces
  7. The composition of copper matte is
  8. A number of elements are available in earth’s crust but most abundant elements are ___________ .
  9. In the extraction of chlorine by electrolysis of brine ___________ .
  10. Which of the following reactions is an example of auto reduction?
  11. The electrolytic reduction technique is used in the extraction of
  12. Which ore can be best concentrated by froth floatation process?
  13. Bessemer converter is used in the manufacture of
  14. The method of zone refining of metals is based on the principle of
  15. Purest form of iron is
  16. Consider the following reaction at 1000° C and Choose the correct statement at 1000°C

📱 Download Our App

Learn MCQs on the go with our easy-to-use Android app

Get it on Google Play