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Q.

(A) Lead, tin and bismuth are purified by liquation method.
(R) Lead, tin and bismuth have low melting points as compared to impurities.

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a

Both (A) and (R) are true but (R) is not the correct explanation of (A)

b

Both (A) and (R) are true and (R) is the correct explanation of (A)

c

Both (A) and (R) are false

d

(A) is true but (R) is false

answer is A.

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Detailed Solution

  • liquation method a low melting metal like tin can be made to flow on a sloping surface. 
  • In this way it is separated from higher melting impurities.
  • lead, tin, and bismuth possess a low melting point and the refining of such metals is carried out through the process of liquidation as their melting point is lower than the impurities.
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(A) Lead, tin and bismuth are purified by liquation method.(R) Lead, tin and bismuth have low melting points as compared to impurities.