Teaching BPSC 4.0 बिहार उच्च माध्यमिक शिक्षक भर्ती (PGT) Mock Test General Science Chemistry Electrochemistry
Extraction of gold and silver involves leaching with CN– ion. Silver is later recovered by
1
Displacement with Zn
2
Liquation
3
Distillation
4
More than one of the above
5
None of the above