Froth Floatation

Q.

The bauxite ore of aluminium is concentrated by froth flotation

1. True

2. False

Q. In froth floatation, the mineral particles become wet by oils while the gangue particles by water.

1. True
2. False

Q. Sulphide ores are converted into oxides by heating them strongly in excess of air. This process is known as

1. calcination
2. roasting
3. poling
4. None of the above

Q.

In froth floatation process, ______ is wetted by the oil and _____ is wetted by the water.

1. mineral, ore

2. gangue, ore

3. ore, gangue

4. mineral, gangue

Q. ____is the process of heating the ore strongly in the absence of air or oxygen.

1. Roasting
2. Smelting
3. Calcination
4. Thermite process

Q. In which among the following processes ore is heated in the presence of excess air to convert the sulphide ore into its oxides?

1. Calcination
2. Roasting
3. Smelting
4. Leaching

Q. Froth floatation process is used to concentrate magnetic ores.

1. False
2. True

Q. Answer the following questions:
(i) Name a metal which is found abundantly in the earth's crust.
(ii) What is the difference between calcination and roasting?
(iii) Name the process used for the enrichment of sulphide ore.
(iv) Write the chemical formulae of one main ore of iron and aluminium.
(v) Write the constituents of electrolyte for the extraction of aluminium.

Q. Which of the following ore is best concentrated by froth flotation method ?

1. Galena
2. Cassiterite
3. Magnetite
4. Zinc blende

Q. In the process of extraction of metals, roasting is applicable for

1. Metal Sulphide
2. Metal carbide
3. Metal oxide
4. Metal fluoride

Q. Give the name and formula of an ore of zinc.
(a) Roasting of the ore.
(b) Reduction of the zinc compound which is the product of the above reaction.
(c) What in addition to a zinc compound, is put into the furnace? State one large scale use of zinc.

Q. Compare the process of calcination and roasting.

Q.

The reason for floating of ore particles in concentration by froth floatation process is that they are

1. (a) light

2. (b) soluble

3. (c) heavy

4. (d) hydrophobic

Q. Explain the floth floatation method with a neat labelled diagram.

Q. The process of zone refining is used in the purification of ___.

1. Si
2. Al
3. Ag
4. Cu

Q.

If both ore and gangue contain sulphur then ___ is used to separate ore from gangue in the froth flotation process.

1. Froth stabilizers

2. depressants

3. Any of the above.

4. oils

Q. An ore that is concentrated by froth flotation method can be converted to its oxide form by the process of _________.

1. calcination
2. roasting
3. smelting
4. gravity separation

Q. <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Explain leaching process. [2 Marks]

Q. Which among the following ores is concentrated by froth floatation?

1. Bauxite
2. Zincite
3. Galena
4. Magnetite

Q. Which among the following ores is concentrated by froth floatation?

1. Bauxite
2. Galena
3. Zincite
4. Magnetite

Q. An ore is concentrated by froth flotation method. That concentrated ore will be converted to its oxide form by___ process.

1. calcination
2. roasting
3. electrolytic refining
4. liquation

Q. A Metal X exists in two types of ores in Earth’s crust which are A and B. A is a sulphide ore while B is a carbonate ore. What processes can be used to convert these ores into their respective metal oxides?​

1. B is converted into metal oxide by roasting.​
2. A is converted into metal oxide by roasting.​
3. B is converted into metal oxide by calcination.​
4. A is converted into metal oxide by calcination.​

Q. An impurity of lead in silver: Cupellation

Q. Lead as impurity in the extraction of silver is removed by :

1. Parke's process
2. Solvay process
3. Cyanide process
4. None of these

Q. In froth flotation, are added to prevent metal sulphides from being wetted by water whileare added to maintain a stable froth layer.

1. fluxes
2. stabilisers
3. depressants
4. collectors

Q. In metallurgy, the concentration of ore is followed by the dressing of ore.

1. True
2. False

Q. (a) Roasting and calcination are the two processes to reduce the metal oxides to the respective metals.
(b) Magnesium is extracted from its ore by electrolytic reduction process.
(c) Cryolite is used in metallurgy of aluminium in order to increase the fusibility and conductivity
(d) I Hall's process bauxite is leached with the help of ${Na}_2{CO}_3$.
Which of the following options regarding the above statements is correct?

1. a, b and c
2. b, c and d
3. c and d
4. only a

Q. Name the ore of a metal which is concentrated by gravity process?

Q. An ore that is concentrated by froth flotation method can be converted to its oxide form by the process of _________.

1. calcination
2. roasting
3. smelting
4. gravity separation

Q.

The principle behind froth floatation method involves the difference in the ________of the ore and the gangue particles.

1. solubility properties

2. wetting properties

3. weight

4. specific gravity