Metallic gold ferquently is found is aluminosilicate rocks and it is finely dispersed among other minerals. It may be extracted by treating the crushed rock with aearated sodium cyanide solution. During this process metallic gold is slowly converted to `[Au(CN)_(2)]^(-)`, Which is soluble in water. After equilibrium has been reached, the aqueous phase is pumped off and the metallic gold is recoverd form it by reacting the gold complex with zinc, whihc is converted tio `[Zn(CN)_(4)]^(2-)`. Gold in nature is frequently alloyed with silver. which is also oxidised vy aerated sodium by aerated sodium cyanide solution.
The correct ionic reaction for the process are:
Metallic gold ferquently is found is aluminosilicate rocks and it is finely dispersed among other minerals. It may be extracted by treating the crushed rock with aearated sodium cyanide solution. During this process metallic gold is slowly converted to `[Au(CN)_(2)]^(-)`, Which is soluble in water. After equilibrium has been reached, the aqueous phase is pumped off and the metallic gold is recoverd form it by reacting the gold complex with zinc, whihc is converted tio `[Zn(CN)_(4)]^(2-)`. Gold in nature is frequently alloyed with silver. which is also oxidised vy aerated sodium by aerated sodium cyanide solution.
The correct ionic reaction for the process are:
The correct ionic reaction for the process are:
A
`4Au+8CN^(-)+2H_(2)O+O_(2)"(air)" rarr4[Au(CN)_(2)]^(-)+4OH^(-)`
B
`Au+2CN^(-) rarr Au[(CN)_(2)]^(-)`
C
`Zn+2CN^(-) rarr Zn[(CN)_(2)]^(-)`
D
`Zn+4CN^(-) rarr Zn[(CN)_(4)]^(-)`
Text Solution
Verified by Experts
The correct Answer is:
d
|
Topper's Solved these Questions
Similar Questions
Explore conceptually related problems
Metallic gold frequently is found in aluminosilicate rocks and it is finely dispersed among other minerals. It may be extracted by treating the crushed rock with aerated sodium cyanide solution. During this process metallic gold is slowly converted t [Au(CN)_(2)]^(-) , which is soluble in water. After equlibrium has been reached, the aqueous phase is pumped off and the metallic gold is recovered from it by reacting the gold complex with zinc, which is converted to [Zn(CN)_(4)]^(2-) , Gold in nature is frequently alloyed with silver is also oxidised by aerated sodium cyanide solution. The correct ionic reaction for the process is//are:
Metallic gold frequently is found in aluminosilicate rocks and it is finely dispersed among other minerals. It may be extracted by treating the crushed rock with aerated sodium cyanide solution. During this process metallic gold is slowly converted t [Au(CN)_(2)]^(-) , which is soluble in water. After equlibrium has been reached, the aqueous phase is pumped off and the metallic gold is recovered from it by reacting the gold complex with zinc, which is converted to [Zn(CN)_(4)]^(2-) , Gold in nature is frequently alloyed with silver is also oxidised by aerated sodium cyanide solution. Which of the follwing is/are correct for cyanide process of extraction of gold?
Knowledge Check
Metallic gold ferquently is found is aluminosilicate rocks and it is finely dispersed among other minerals. It may be extracted by treating the crushed rock with aearated sodium cyanide solution. During this process metallic gold is slowly converted to [Au(CN)_(2)]^(-) , Which is soluble in water. After equilibrium has been reached, the aqueous phase is pumped off and the metallic gold is recoverd form it by reacting the gold complex with zinc, whihc is converted tio [Zn(CN)_(4)]^(2-) . Gold in nature is frequently alloyed with silver. which is also oxidised vy aerated sodium by aerated sodium cyanide solution The process described in the passage represents:
Metallic gold ferquently is found is aluminosilicate rocks and it is finely dispersed among other minerals. It may be extracted by treating the crushed rock with aearated sodium cyanide solution. During this process metallic gold is slowly converted to [Au(CN)_(2)]^(-) , Which is soluble in water. After equilibrium has been reached, the aqueous phase is pumped off and the metallic gold is recoverd form it by reacting the gold complex with zinc, whihc is converted tio [Zn(CN)_(4)]^(2-) . Gold in nature is frequently alloyed with silver. which is also oxidised vy aerated sodium by aerated sodium cyanide solution The process described in the passage represents:
A
ore concentration
B
pyrometallurgical extraction
C
hydrometallurgical extraction
D
purification of metal
Metallic gold ferquently is found is aluminosilicate rocks and it is finely dispersed among other minerals. It may be extracted by treating the crushed rock with aearated sodium cyanide solution. During this process metallic gold is slowly converted to [Au(CN)_(2)]^(-) , Which is soluble in water. After equilibrium has been reached, the aqueous phase is pumped off and the metallic gold is recoverd form it by reacting the gold complex with zinc, whihc is converted tio [Zn(CN)_(4)]^(2-) . Gold in nature is frequently alloyed with silver. which is also oxidised vy aerated sodium by aerated sodium cyanide solution There have been several to develop alternative gold extraction processs whihc could replace this one. This due to:
Metallic gold ferquently is found is aluminosilicate rocks and it is finely dispersed among other minerals. It may be extracted by treating the crushed rock with aearated sodium cyanide solution. During this process metallic gold is slowly converted to [Au(CN)_(2)]^(-) , Which is soluble in water. After equilibrium has been reached, the aqueous phase is pumped off and the metallic gold is recoverd form it by reacting the gold complex with zinc, whihc is converted tio [Zn(CN)_(4)]^(2-) . Gold in nature is frequently alloyed with silver. which is also oxidised vy aerated sodium by aerated sodium cyanide solution There have been several to develop alternative gold extraction processs whihc could replace this one. This due to:
A
Sodium cyanide solutions corrode mining machinery.
B
Sodium cyanide escapes into ground water and produces hydrogen cyanide which is toxic.
C
Gold obtained by this process is not pure.
D
The amount of gold in aluminosilicate rocks is very less.
Metallic gold frequently is found in aluminosilicate rocks and it is finely dispersed among other minerals. It may be extracted by treating the crushed rock with aerated sodium cyanide solution. During this process metallic gold is slowly converted t [Au(CN)_(2)]^(-) , which is soluble in water. After equlibrium has been reached, the aqueous phase is pumped off and the metallic gold is recovered from it by reacting the gold complex with zinc, which is converted to [Zn(CN)_(4)]^(2-) , Gold in nature is frequently alloyed with silver is also oxidised by aerated sodium cyanide solution. The correct ionic reaction for the process is//are:
Metallic gold frequently is found in aluminosilicate rocks and it is finely dispersed among other minerals. It may be extracted by treating the crushed rock with aerated sodium cyanide solution. During this process metallic gold is slowly converted t [Au(CN)_(2)]^(-) , which is soluble in water. After equlibrium has been reached, the aqueous phase is pumped off and the metallic gold is recovered from it by reacting the gold complex with zinc, which is converted to [Zn(CN)_(4)]^(2-) , Gold in nature is frequently alloyed with silver is also oxidised by aerated sodium cyanide solution. The correct ionic reaction for the process is//are:
A
`Au+2CN^(-)rarrAr[(CN)_(2)]^(-)`
B
`Zn+2CN^(-)rarZn[(CN)_(2)]^(-)`
C
`4Au+8CN^(-)+2H_(2)O+O_(2)("air")rarr4[Au(CN)_(2)]^(-)("soluble")+4OH^(-)`
D
`Zn+4CN^(-)rarrZn[(CN)_(4)]^(2-)`
Similar Questions
Explore conceptually related problems
Metallic gold frequently is found in aluminosilicate rocks and it is finely dispersed among other minerals. It may be extracted by treating the crushed rock with aerated sodium cyanide solution. During this process metallic gold is slowly converted t [Au(CN)_(2)]^(-) , which is soluble in water. After equlibrium has been reached, the aqueous phase is pumped off and the metallic gold is recovered from it by reacting the gold complex with zinc, which is converted to [Zn(CN)_(4)]^(2-) , Gold in nature is frequently alloyed with silver is also oxidised by aerated sodium cyanide solution. Which of the follwing is/are correct for cyanide process of extraction of gold?
Metallic gold frequently is found is aluminosilicate rocks and it is finely dispersed among other minerals it may be extracted by treating the crushed rock with aerated potassium cyanide solution. During this process metallic gold is slowly converted to [Au(CN)_(2)]^(-) , which is soluble in water. After equilibrium has been reached, the aqueous is pumped off and the metallic gold is recovered form it by reacting the gold complex with zinc, which is converted to [Zn(CN)_(4)]^(2-) . Gold in nature is frequently alloyed with silver which is also oxidised by aerated sodium cyanide solution. Silver occurs as native as well as sulphurised ore. The correct reaction involved in the leaching of gold with dilute solution of NaCN is :
Metallic gold frequently is found is aluminosilicate rocks and it is finely dispersed among other minerals it may be extracted by treating the crushed rock with aerated potassium cyanide solution. During this process metallic gold is slowly converted to [Au(CN)_(2)]^(-) , which is soluble in water. After equilibrium has been reached, the aqueous is pumped off and the metallic gold is recovered form it by reacting the gold complex with zinc, which is converted to [Zn(CN)_(4)]^(2-) . Gold in nature is frequently alloyed with silver which is also oxidised by aerated sodium cyanide solution. Silver occurs as native as well as sulphurised ore. The process described above in the passage is regarding:
Metallic gold frequently is found is aluminosilicate rocks and it is finely dispersed among other minerals it may be extracted by treating the crushed rock with aerated potassium cyanide solution. During this process metallic gold is slowly converted to [Au(CN)_(2)]^(-) , which is soluble in water. After equilibrium has been reached, the aqueous is pumped off and the metallic gold is recovered form it by reacting the gold complex with zinc, which is converted to [Zn(CN)_(4)]^(2-) . Gold in nature is frequently alloyed with silver which is also oxidised by aerated sodium cyanide solution. Silver occurs as native as well as sulphurised ore. The process described above in the passage is regarding:
Metallic gold frequently is found is aluminosilicate rocks and it is finely dispersed among other minerals it may be extracted by treating the crushed rock with aerated potassium cyanide solution. During this process metallic gold is slowly converted to [Au(CN)_(2)]^(-) , which is soluble in water. After equilibrium has been reached, the aqueous is pumped off and the metallic gold is recovered form it by reacting the gold complex with zinc, which is converted to [Zn(CN)_(4)]^(2-) . Gold in nature is frequently alloyed with silver which is also oxidised by aerated sodium cyanide solution. Silver occurs as native as well as sulphurised ore. Which of the following statement is correct?