Question:
Gold is extracted by hydrometallurgical process, based on its property
Gold is extracted by hydrometallurgical process, based on its property
Show Hint
Cyanide process works due to formation of soluble metal complexes.
Updated On: Apr 23, 2026
- of being electropositive
- of being less reactive
- to form complexes which are water soluble
- to form salts which are water soluble
Show Solution
Verified By Collegedunia
The Correct Option is C
Solution and Explanation
Concept:
Gold extraction uses cyanide leaching, where gold forms soluble complex.
Step 1: Reaction: \[ 4Au + 8CN^- + O_2 + 2H_2O \rightarrow 4[Au(CN)_2]^- + 4OH^- \]
Step 2: Key property:
Gold forms stable, soluble complex ions. Conclusion:
Thus, extraction is based on complex formation.
Step 1: Reaction: \[ 4Au + 8CN^- + O_2 + 2H_2O \rightarrow 4[Au(CN)_2]^- + 4OH^- \]
Step 2: Key property:
Gold forms stable, soluble complex ions. Conclusion:
Thus, extraction is based on complex formation.
Was this answer helpful?
0
0
Top MET Chemistry Questions
- Which of the following product is formed in the reaction $ CH_3MgBr {->[(i)CO_2][(ii)H_2O]} ? $
- Ethyl chloride is converted into diethyl ether by:
- Correct order of reactivity:
- A group of 13 element if added in small amounts to Ge, then the type of semiconductor formed is
- Consider the following statements I. Repulsive forces are significant when the molecules are close together on average. II. Attractive intermolecular forces are important when the molecules are fairly close together but not necessarily touching. III. Attractive forces are ineffective when the molecules are for apart. Select correct statements.
View More Questions
Top MET Metallurgy Questions
- \( \Delta G^{\circ} \) vs T plot in the Ellingham's diagram slopes downwards for the reaction:
- Which of the following taking place in the blast furnace is endothermic?
- Which of the following taking place in the blast furnace is endothermic?
- All ores are minerals, while all minerals are not ores, because
- A body of mass m moving along a straight line covers half the distance with a speed of $2~\text{m s}^{-1}$. The remaining half of the distance is covered in two equal time intervals with speeds of $3~\text{m s}^{-1}$ and $5~\text{m s}^{-1}$ respectively. The average speed of the particle for the entire journey is
View More Questions
Top MET Questions
- A coil of 100 turns and area $2 \times 10^{-2}m^2 $ is pivoted about a vertical diameter in a uniform magnetic field and carries a current of 5A. When the coil is held with its plane in north-south direction, it experiences a couple of 0.33 Nm. When the plane is east-west, the corresponding couple is 0.4 Nm, the value of magnetic induction is [Neglect earth's magnetic field]
- $\int\limits_{0}^{8}| x -5| d x$ is equal to
- Radiation, with wavelength 6561 $?$ falls on a metal surface to produce photoelectrons. The electrons are made to enter a uniform magnetic field of $3 \times 10^{-4} T$. If the radius of the largest circular path followed by the electrons is 10 mm, the work function of the metal is close to :
- In intrinsic semiconductor at room temperature number of electrons and holes are
- Which of the following product is formed in the reaction $ CH_3MgBr {->[(i)CO_2][(ii)H_2O]} ? $
View More Questions