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Zone refining is used to obtain metals i...

Zone refining is used to obtain metals in high degree of purity.
During electrorefining pure metal is liberated at the cathode.

A

If both (A) and ( R) are correct and ( R) is the correct explanation of (A).

B

If both (A) and ( R) are correct, but ( R) is not the correct explanation of (A).

C

If (A) is correct, but ( R) is incorrect.

D

If (A) is incorrect, but ( R) is correct.

Text Solution

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The correct Answer is:
B
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CENGAGE CHEMISTRY-GENERAL PRINCIPLES AND PROCESS OF ISOLATION OF ELEMENTS-Exercise (Assertion-Reasoning)
  1. Assertion: All minerals are ore. Reason: Ores are minerals from whic...

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  2. Argentite ore is concentrated by froth flotation process. Argentite ...

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  3. All metals cannot be obtained by carbon reduction. Carbon is a very ...

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  4. Assertion: Durig calcination the ore is heated well below its melting ...

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  5. Oxygen is the most abundant element. Aluminium is the most abundant ...

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  6. A: Highly electropositive metals are extracted by electrolysis of thei...

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  7. Zone refining is used to obtain metals in high degree of purity. Dur...

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  8. Assertion :Ti can be purified by Van Arkel process. Reason: TiI(4) ...

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  9. Assertion: Aluminothermy is used for extraction of chromium form chrom...

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  10. Assertion: Ag and Au are extracted by leaching the ores with a dilute ...

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  11. By froth flotation process, carbonate and hydroxide ores are concentra...

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  12. Standard free energy of formation for Al(2)O(3) and Cr(2)O(3) at 1273 ...

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  13. Metals of high purity are obtained by zone refining. Impurities are ...

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  14. Assertion: Nickel is purified by reaction it with CO. Reason: Impur...

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  15. During reduction of ZnO to Zn, C is more efficient than CO. The stan...

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  16. Graphite is used as anode but diamond is not. There exist free elect...

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  17. Silver may be prepared by using silver coins. In this process, coins a...

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  18. Reduction of Fe(2)O(3) with CO is done below 710^@C. Delta(f) G^(Ө) ...

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