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Q.

Black tin is :

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a

100 percent SnO2

b

an allotrope of Sn

c

60-70 percent  SnO2

d

an alloy of Sn

answer is C.

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Detailed Solution

Blank tin⇒60−70%SnO2

The primary source of tin for extraction is tin dioxide. Black tin is also a source of tin, and roughly 60–70% of its composition is made up of cassiterite.

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