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# Which of the following alloys of copper does not contain tin ?

$\begin {array} {1 1} (A)\;\text{Bronze} & \quad (B)\;\text{Phosphor bronze} \\ (C)\;\text{Silica bronze} & \quad (D)\;\text{German silver} \end {array}$

The composition of German silver is $\text{Cu}$ (25 - 50 %), $\text{Zn}$ (25 - 35 %) and $\text{Ni}$ (10 - 35 %),