JEE Main 2022 · 27 Jun · Shift 2 · Chemistry Q63

← JEE Main 2022 · 27 Jun · Shift 2

ChemistrySingle correct+4 / -1Question 63 of 90

Statement I: Leaching of gold with cyanide ion in absence of air / $\mathrm{O_2}$ leads to cyano complex of Au(III).

Statement II: Zinc is oxidized during the displacement reaction carried out for gold extraction.

In the light of the above statements, choose the correct answer from the options given below.

Both statement I and statement II are correct.

Both statement I and statement II are incorrect.

Statement I is correct but statement II is incorrect.

Statement I is incorrect but statement II is correct.

Answer and worked solution

Official answer: D

Statement I is false: leaching needs air/O₂ and gives $\mathrm{[Au(CN)_2]^-}$ , an Au(I) complex. Statement II is true: Zn is oxidised to $\mathrm{[Zn(CN)_4]^{2-}}$ .

(D)

Topics:Extraction of specific metals

← Previous question Next question →

JEE Main 2022 · 27 Jun · Shift 2, Chemistry question 63