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B
70% Cu and 30% Zn
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C
30% Cu and 70% Sn
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D
70% Cu and 30% Pb
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Solution
The correct option is B 70% Cu and 30% Zn Brass is a mixture of copper (Cu) and zinc (Zn). It has a composition of approximately 30% zinc and 70% copper. It is used in the manufacture of locks, bearings, etc.
Hence, the correct answer is option (b).