Enrichment of Ores

Q. Mention the steps involved in extraction of metals from ores

Q.

Define the following terms :

(i) Mineral

(ii) Ore

(iii) Gangue

Q.

What Are Examples Of Ores?

Q. What are the four main steps involved in extraction of metals from their ores???

Q.

(a) Define the terms (i) mineral (ii) ore, and (iii) dengue.
(b) What is meant by the concentration of ore
(c) Name one ore of copper (other than cuprite)? Which compound of copper present in this ore? Also, write its chemical formula.

Q.

Which of the following ores cannot be concentrated by electromagnetic separation?

1. Chromite

2. Magnetite

3. Pyrolusite

4. Cuprite

Q. Which of the following ores can be concentrated by electromagnetic separation?

1. Chromite
2. Magnetite
3. Pyrolusite
4. Cuprite

Q.

Iron oxide ore is purified by magnetic separation, but iron sulphide is separated from impurities by froth flotation. Why?

Q. The Earth’s crust is the major source of metals.

1. False
2. True

Q.

Ores mined from the earth are usually contaminated with large amounts of impurities such as soil, sand, etc., are called ____________.

1. Sulphides

2. Flux

3. Gangue

4. Minerals

Q. Which pair of the following metals are extracted just by heating with their sulphide ores in air?

1. Silver and mercury
2. Iron and mercury
3. Mercury and copper
4. Mercury and magnesium

Q. ___ is the process of extraction of metals from their ores.

Q. Directions: In the following questions, a statement of assertion is followed by a statement of reason.
Mark the correct choice as:
Assertion: For acidic impurities like $Si{O}_2$ present in an ore, basic fluxes are used.
Reason: Lime is a basic flux.

1. Both assertion and reason are false.
2. Both assertion and reason are true and reason is the correct explanation of assertion.
3. Both assertion and reason are true but reason is not the correct explanation of assertion.
4. Assertion is true but reason is false.

Q.

Gravity separation method is based upon

1. preferential washing of ore and gangue particles.

2. difference in the densities of ore particles and impurities.

3. difference in the chemical property of ore particles and impurities.

4. none of these

Q.

What will be the reaction when Sodium metal is dropped into water?

Q.

Metallurgy is a process of extracting:

1. metal from its mineral

2. gangue particles from its ore

3. pure metal from its ore

4. non metal from its ore

Q. Which method for the concentration or dressing of ores is depicted below?

1. froth floatation
2. magnetic separation
3. washing
4. gravity separation

Q. Cassiterite is concentrated by to remove lighter impurites followed by to remove minerals like wolframite.

1. levigation
2. magnetic separation
3. leaching
4. froth flotation

Q.

Magnetic separation method is only used when either of the two, the ore or the gangue, is magnetic.

1. True
2. False

Q.

Which oil is used as frother in froth floatation process?

1. Mustard oil

2. Coconut oil

3. Olive oil

4. Pine oil

Q. Name 2 mwpetalsa that can be used to reduce metal oxides to metals

Q.

Define the following terms.

(i) Ore

(ii) Gangue

Q. Hall Heroult's process is used in the industrial production of Aluminium.

1. True
2. False

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

1. gangue, ore
2. mineral, gangue
3. ore, gangue
4. mineral, ore

Q. Which of the following ores is best concentrated by froth floatation method?

1. Galena
2. Cassiterite
3. Magnetite
4. Malachite

Q. Cinnabar is an ore of

1. 
   Pb
2. 
   Zn
3. 
   Cu
4. 
   Hg

Q. Ore dressing for iron is done by:

1. froth floatation process
2. magnetic separation
3. hand picking
4. all of the above

Q.

To which ore does calamine belong to

1. Iron

2. Zinc

3. Copper

4. Aluminium

Q. Explain the terms.

(a) Ore (b) Gangue (c) Metallurgy

Q. How many metallic ores are concentrated by magnetic separation method from the given ores?
Cassiterite, Pyrolusite, Rutile, Magnetite, Galena, Cinnabar