"Softening of lead" means the (A) conversion of \( \mathrm{PbS} \) into \( \mathrm{Pb} \) (B) re...

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"Softening of lead" means the
(A) conversion of \( \mathrm{PbS} \) into \( \mathrm{Pb} \)
(B) removal of tin from common solder
(C) removal of impurities from \( \mathrm{Pb} \)
(D) addition of tin to lead
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