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List - I List - II
A. vanArkel method a. Manufacture of caustic soda
B. Solvay process b. Purification of Titanium
C. Cupellation c. Manufacture of Na₂CO₃
D. Poling d. Purification of copper
e. Refining of silver
A B C D
1. b a c d
2. d c b e
3. b c e d
4. e a c d

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answer is C.

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Detailed Solution

(A) vanArkel method, is very useful for removing all the oxygen and nitrogen present in the form of impurity in certain metals like zirconium and titanium.

(B) Solvay process is usd for manufacture of Na₂CO₃

(C) Cupellation is useful when the metal possesses easily oxidisable impurities. Silver metal containing lead as impurity can be purified by this method.

(D) Poling : Copper and tin are purified by this method.

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