Q.

Which one is soIder?

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a

Cu and Pb

b

Zn and Cu

c

Pb and Sn

d

Fe and Zn

answer is C.

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Detailed Solution

Soft solder is made of tin and lead; lead is used to prevent the development of tin whiskers while tin is used for its lower melting point. The tensile and shear strengths improve with increasing tin content.

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