Leaching

Q. Which of the following method is used for the concentration of bauxite ore?

1. Magnetic seperation
2. Leaching
3. Forth floatation
4. Levigation

Q.

Define the following:

1. Permutit process
2. Calgons process
3. Ion exchange process

Q. Addition of to remove gangue, results in the formation of a fusible compound called.

1. matrix
2. flux
3. slag
4. froth

Q.

In the calcination process, the ore is heated in

1. the absence of oxygen.

2. excess oxygen.

3. the absence of nitrogen.

4. the absence of air.

Q. Which of the following methods is mainly used for the concentration of sulphide ores?

1. Washing
2. Froth floatation
3. Handpicking
4. Magnetic separation

Q. Which among the following is a chemical method of concentration of ores?

1. Leaching
2. Gravity separation
3. Magnetic separation
4. Froth floatation

Q.

Which of the following processes is not a physical process of separation?

1. Levigation

2. Magnetic separation

3. Leaching

4. Froth floatation

Q. 10. Explain Serpecks method of heating bauxite

Q. ________ is the process used to concentrate magnetic ores.

1. Roasting
2. Magnetic separation
3. Leaching
4. Froath floatation

Q. Which of these statements are correct regarding the leaching process?
P: It involves the treatment of ore with a suitable reagent to make it soluble.
Q: During leaching, impurities remains insoluble, and the ore is not recovered from the solution by evaporation.
R: Leaching offers excellent chemical selectivity and flexibility throughout the process.

1. Q and R
2. P and Q
3. P and R
4. Only P

Q. Which of the following statements are true for Leaching?

1. It involves treatment of ore with a suitable reagent as to make it soluble.
2. During leaching, impurities remain insoluble and the ore is recovered from solution by using a suitable chemical method.
3. Gold and silver are extracted from their native ores by Leaching
4. Leaching offers excellent chemical selectivity and flexibility throughout the process and also minimizes the need for very high temperatures and refractory materials

Q.

The process by which sulphide ore is concentrated.

Q. 8. Are calcination and roasting reduction processes

Q.

Is zinc oxide a natural ingredient?

Q. _________ is used to treat bauxite ore during leaching.

1. NaOH
2. NaCl
3. HCl
4. KCl

Q.

Which one of the following methods is best suited for the concentration of Bauxite ore?

1. Hydraulic washing

2. Hydrometallurgy

3. Froth flotation

4. Magnetic separation

Q.

Formula of Hematite

1. ${\mathrm{Fe}}_2{\mathrm{O}}_3$

2. ${\mathrm{Al}}_2{\mathrm{O}}_3$

3. ${\mathrm{ZnCO}}_3$

4. ${\mathrm{Na}}_3{\mathrm{AlF}}_6$

Q. The carbonate ore ($XC{O}_3$) of a highly active metal X (heavy and non-magnetic) is given. Which process can be used for the concentration of ore?

1. Hydraulic washing
2. Leaching
3. Magnetic separation
4. Froth floatation

Q. Is rusting of iron an example of a chemical reaction? If yes, give the chemical equation for rusting of iron.

Q. Complexes formed in the following methods are :
(I) Mond's process for purification of nickel.
(II) Removal of unreacted AgBr from photographic plate.
(III) Removal of lead poisoning from the body.

1. $Ni(CO{)}_4$, $\left[Ag\right(CN{)}_2{]}^{-}$, $\left[Pb\right(EDTA){]}^{2-}$
2. $Ni(CO{)}_4$, $\left[Ag\right(S_2{O}_3{)}_2{]}^{3-}$, $\left[Pb\right(EDTA){]}^{2-}$
3. $Ni(CO{)}_6$, $\left[Ag\right(S_2{O}_3{)}_2{]}^{3-}$, $\left[Pb\right(EDTA){]}^{4-}$
4. $Ni(CO{)}_6$, $\left[Ag\right(S_2{O}_3){]}^{-}$, $\left[Pb\right(EDTA){]}^{2-}$

Q. ________ is the process used to concentrate magnetic ores.

1. Roasting
2. Magnetic separation
3. Leaching
4. Froath floatation

Q. Choose the option depicting the correct match of the ore and the concentration method used for them.

Column A	Column B
(a) Copper glance	(i) Froth floatation
(b) Bauxite	(ii) Magnetic separation
(c) Siderite	(iii) Leaching

1. a: iii; b: ii; c: i
2. a: ii; b: iii; c: i
3. a: i; b: ii; c: iii
4. a: i; b: iii; c: ii

Q. <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Define metallurgy.

Q. Explain leaching process.

Q.

The following questions are related to the extraction of aluminum by electrolysis.

1. Name the other aluminum-containing compound added to alumina and state its significance.
2. Give the equation for the reaction that takes place at the cathode.
3. Explain, why is it necessary to renew the anode periodically?

Q. Which of the following statements are true for leaching?​

1. Leaching offers excellent chemical selectivity and flexibility throughout the process and also minimizes the need for very high temperatures and refractory materials.
2. During leaching, impurities remains soluble, and the ore is recovered from the solution by using evaporation.
3. It involves the treatment of the ore with a suitable reagent so as to make it soluble.​

Q. Which of the following method is used for the concentration of bauxite ore?

1. Levigation
2. Magnetic seperation
3. Leaching
4. Froth floatation

Q. Math the following pair

1. Presence of air
2. Absence of air
3. Oxidation
4. Reduction

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.

Which of the following processes is not a physical process of separation?

1. Levigation

2. Magnetic separation

3. Froth floatation

4. Leaching