JEE Advanced Model Paper 9 with solutions for online practice

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Question : 3 of 57

Marks: +1, -0

Which, amongst the following extraction processes, involves the principle ofhydrometallurgy?

Ni
impure
+ 4CO
330K
→
Ni(CO)4
450K
→

Ni
pure
+ 4CO
4Au + 4NaCN + O2 + H2O
→
−4KOH

4Na[Au(CN)2]
soluble

Zn
→
2Na2[Zn(CN)4] + 4 Au
TiCl4 + 2Mg → Ti + 2MgCl2
2Cu2S + 3O2 → 2Cu2O + 2SO2
Cu2S + 2Cu2O → 6Cu + SO2

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