Question
Question: Black tin is...
Black tin is
A
An alloy of Sn
B
An allotrope of Sn
C
60-70 percent SnO2
D
100 percent SnO2
Answer
60-70 percent SnO2
Explanation
Solution
The purified ore, cassiterite containing 60-70% SnO2 is called as black tin.
Black tin is
An alloy of Sn
An allotrope of Sn
60-70 percent SnO2
100 percent SnO2
60-70 percent SnO2
The purified ore, cassiterite containing 60-70% SnO2 is called as black tin.