Cyanide or Macarthur Forrest Process

Q. In the cyanide extraction process of silver from argentite ore, the oxidizing and reducing agents used are:

1. $O_2$ and $CO$ respectively

2. $O_2$ and Zn dust respectively

3. $HN{O}_3$ and Zn dust respectively

4. $HN{O}_3$ and $CO$ respectively

Q. Native silver metal forms a water-soluble complex with a dilute aqueous solution of NaCN in the presence of:

1. Nitrogen
2. Oxygen
3. Carbon dioxide
4. Argon

Q. In the process of extraction of gold,
$Roastedgoldore+C{N}^{-}+H_{2}O\stackrel{O_2}{⟶}\left[X\right]+O{H}^{-}$
$\left[X\right]+Zn⟶\left[Y\right]+Au$

1. X = $\left[Au\right(CN{)}_2{]}^{-}$, Y = $\left[Zn\right(CN{)}_4{]}^{2-}$
2. X = $\left[Au\right(CN{)}_4{]}^{3-}$, Y = $\left[Zn\right(CN{)}_4{]}^{2-}$
3. X = $\left[Au\right(CN{)}_2{]}^{-}$, Y = $\left[Zn\right(CN{)}_6{]}^{4-}$
4. X = $\left[Au\right(CN{)}_4{]}^{-}$, Y = $\left[Zn\right(CN{)}_4{]}^{2-}$

Q. In the cyanide extraction process of silver from argentite ore, the oxidizing and reducing agents used are:

1. $O_2$ and $CO$ respectively

2. $O_2$ and Zn dust respectively

3. $HN{O}_3$ and Zn dust respectively

4. $HN{O}_3$ and $CO$ respectively

Q. The cyanide process of gold extraction involves leaching out gold from its ore with $C{N}^{-}$ in the presence of Q in water to form R. Subsequently, R is treated with T to obtain $Au$ and Z. Choose the correct option(s).

1. Z is $\left[Zn\right(CN{)}_4{]}^{2-}$
2. T is $Zn$
3. R is $\left[Au\right(CN{)}_4{]}^{-}$
4. Q is $O_2$

Q. Complexes formed in the cyanide process are:

1. $\left[Au\right(CN{)}_2{]}^{-}$
2. $\left[Ag\right(CN{)}_2{]}^{-}$
3. $\left[Au\right(CN{)}_4{]}^{2-}$
4. $\left[Zn\right(CN{)}_4{]}^{2-}$

Q.

Which of the following is cyanide process?

1. MacArthur Forrest process

2. Gold Cyanidation

3. Both a and b

4. None of these