Bell metal is an alloy of: A. Sn and Pb B. Cu and PbC. Sn and CuD. Fe, Sn and Cu

Bell metal is an alloy primarily composed of copper (Cu) and tin (Sn). Therefore, the correct answer is:

C. Sn and Cu

Explanation:
Composition of Bell Metal:

Bell metal is typically made up of about 70% copper and 30% tin. The addition of tin to copper improves its casting ability and gives it a distinct tonal quality when struck, which is why it is commonly used in the production of bells and other musical instruments.
Properties of Bell Metal:

The copper provides strength and durability, while the tin enhances corrosion resistance and improves the alloy's workability.
The resultant alloy has a bright appearance and can produce a clear, ringing sound, which is essential for bells.
Comparison with Other Options:
A. Sn and Pb: This combination refers to solder, not bell metal.
B. Cu and Pb: This could refer to certain types of bronze, but it is not the typical composition of bell metal.
D. Fe, Sn and Cu: This combination does not accurately describe bell metal and would likely yield a different type of alloy.
Thus, the correct option for bell metal is C. Sn and Cu.