Q24. Match List - I with List - II.
List - I
(A) Pbs → PbO
(B) CaCO3 → CaO
(C) ZnS → Zn
(D) Cu2S → C

Q: What is the correct answer for CUET UG Chemistry Q24?

The correct answer is B. A. PbS → PbO: This is roasting, where sulfide ore is heated in the presence of air to convert it to oxide. So (A) -> (I).B. CaCO3 → CaO: This is calcination, where a carbonate ore is heated in limited or no air to decompose it into oxide. So (B) -> (II).C. ZnS → Zn: Zinc sulfide is first roasted to ZnO, and then ZnO is reduced to Zn using carbon (carbon reduction). So (C) -> (III).D. Cu2S → Cu: Co

Q: Q24. Match List - I with List - II. List - I (A) Pbs → PbO (B) CaCO3 → CaO (C) ZnS → Zn (D) Cu2S → Cu List - II (I) Roasting (II) Calcination (III) Carbon reduction (IV) Self reduction Choose the…

The correct answer is B. A. PbS → PbO: This is roasting, where sulfide ore is heated in the presence of air to convert it to oxide. So (A) -> (I).B. CaCO3 → CaO: This is calcination, where a carbonate ore is heated in limited or no air to decompose it into oxide. So (B) -> (II).C. ZnS → Zn: Zinc sulfide is first roasted to ZnO, and then ZnO is reduced to Zn using carbon (carbon reduction). So (C) -> (III).D. Cu2S → Cu: Co

Q: What are the options for this CUET UG Chemistry question?

A. (a) (A)-(IV), (B)-(III), (C)-(I), (D)-(II) · B. (b) (A)-(I), (B)-(II), (C)-(III), (D)-(IV) · C. (c) (A)-(III), (B)-(IV), (C)-(II), (D)-(I) · D. (d) (A)-(II), (B)-(III), (C)-(IV), (D)-(I)

Question

Q24. Match List - I with List - II.
List - I
(A) Pbs → PbO
(B) CaCO3 → CaO
(C) ZnS → Zn
(D) Cu2S → Cu
List - II
(I) Roasting
(II) Calcination
(III) Carbon reduction
(IV) Self reduction
Choose the correct answer from the options given below:
(a) (A)-(IV), (B)-(III), (C)-(I), (D)-(II)
(b) (A)-(I), (B)-(II), (C)-(III), (D)-(IV)
(c) (A)-(III), (B)-(IV), (C)-(II), (D)-(I)
(d) (A)-(II), (B)-(III), (C)-(IV), (D)-(I)

FirstInTest · Accepted Answer

A. PbS → PbO: This is roasting, where sulfide ore is heated in the presence of air to convert it to oxide. So (A) -> (I).B. CaCO3 → CaO: This is calcination, where a carbonate ore is heated in limited or no air to decompose it into oxide. So (B) -> (II).C. ZnS → Zn: Zinc sulfide is first roasted to ZnO, and then ZnO is reduced to Zn using carbon (carbon reduction). So (C) -> (III).D. Cu2S → Cu: Copper(I) sulfide can undergo self-reduction (or auto-reduction) by heating in air, where some Cu2S is oxidized to Cu2O, which then reacts with remaining Cu2S to form Cu metal. So (D) -> (IV).Therefore, the correct match is (A)-(I), (B)-(II), (C)-(III), (D)-(IV).

Answer

(a) (A)-(IV), (B)-(III), (C)-(I), (D)-(II)

Answer

(b) (A)-(I), (B)-(II), (C)-(III), (D)-(IV)

Answer

(c) (A)-(III), (B)-(IV), (C)-(II), (D)-(I)

Answer

(d) (A)-(II), (B)-(III), (C)-(IV), (D)-(I)

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