A hydrometallurgical process involves the following steps. {\Ag}_2 {\S}+4 {\NaCN} \to 2 {\Na} [ {\Ag}( {\CN})_2] + {\Na}_2 {\S} 2 {\Na} [ {\Ag}( {\CN})_2] + {\Zn} \to {\Na}_2 [ {\Zn}( {\CN})_4] +2 {\Ag} ↓ Which one of the following statements is true?

Correct Answer is : Tetracyanozinc(II) complex is soluble in water

In the second step {\Zn} (II) is reduced to {\Zn}(0)

Dicyanoargentum(I) complex is insoluble in water

In the first step {\Ag}( {\I}) is reduced to {\Ag}(0)

Tetracyanozinc(II) complex is soluble in water

CUSAT 2021 BTech Solved Paper Shift 3

Question : 101 of 250

Marks: +1, -0

A hydrometallurgical process involves the following steps.
‌Ag2S+4‌NaCN→2‌Na[Ag(CN)2]+Na2S
‌2‌Na[Ag(CN)2]+Zn→Na2[Zn(CN)4]+2‌Ag↓
Which one of the following statements is true?

In the second step Zn (II) is reduced to Zn(0)
Dicyanoargentum(I) complex is insoluble in water
In the first step Ag(I) is reduced to Ag(0)
Tetracyanozinc(II) complex is soluble in water

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