Q.

Which of the following metal is preferred for manufacturing micro electrodes?

A. Stainless steel
B. Tungsten
C. Iron
D. Copper
Answer» B. Tungsten
Explanation: Tungsten is preferred for constructing micro-electrodes due to its mechanical strength and its apparent inertness. Although tungsten itself is reactive, a surface layer of tungsten oxide will, in most situations, protect the metal against corrosion.
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