1.

Which among the following cannot exist in local equilibrium with solder enriched with Bi at 200 degree Celsius?

A. Cu<sub>6</sub>Sn<sub>5</sub>
B. Cu<sub>3</sub>Sn
C. Cu<sub>9</sub>Sn<sub>5</sub>
D. CuSn<sub>7</sub>
Answer» D. CuSn<sub>7</sub>


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