Which among the following cannot exist in local equilibrium with solde – McqOptions

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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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