Gravity Separation

Q.

Balance the following and identify the reaction

Silver Bromide on exposure to sunlight decomposes into silver and bromine

Q. On analysis it was found that the black oxide of copper and red oxide of copper contain 80% and 89% of copper respctvly. Show that this data is in accordance with law of multiple proportion.

Q.

What is the role of the stabilizer in the froth flotation method?

Q.

What are the froth stabilizers?

Q. Define the following
(a) Leaching
(b) Metallurgy
(c) Anisotropy
Derive an expression for maximum work.
The boiling point of benzene is 353.23 K. When 1.80 gram of non-volatile solute was dissolved in 90 gram of benzene, the boiling point is raised to 354.11 K. Calculate the molar mass of solute.
[$K_b$ for benzene = 2.53 K mol${}^{-1}$]

Q.

What is the ore of mercury?

Q.

___ method is generally used for the concentration of sulphide ores?

Q. Gravity separation is also called ___ .

1. levitation
2. distillation
3. levigation
4. magnetic seperation

Q. Which method is used for the purification of blister copper?

1. Poling
2. Liquation
3. Distillation
4. Electrolysis

Q.

During ionization, metals lose electrons.This change can be called as:

1. Oxidation

2. Reduction

3. Displacement

4. Redox

Q. 6.In mineral kinoite change of silicate anion is?

Q.

How does calcination differ from roasting?

Q.

Define the following terms:

1. Matrix

2. Flux

3. Slag

Q. The balanced net ionic equation for the reaction of aluminium sulphate and sodium hydroxide contains which of the following terms? a. 3Al^3+(aq) b. OH^- (aq) c. 3OH^- (aq) d. 2Al^3+ (aq)

Q.

Explain, what happens if bauxite containing iron and silica as impurities is directly subjected to the process of electrolytic reduction without prior purification.

Q.

Is an ether flammable?

Q. Assertion :Leaching is a process of reduction. Reason: Leaching involves treatment of the ore with a suitable reagent so as to make it soluble while impurities remains insoluble.

1. If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
2. If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
3. If Assertion is correct but Reason is incorrect.
4. If Assertion is incorrect but Reason is correct.

Q. The finishing process of glass includes cutting, grinding and polishing of the glass.

1. True
2. False

Q.

In an ore, the gangue particles are highly denser than ore particles. The process used for concentration of the ore is ___.

1. leaching

2. froth floatation

3. gravity separation

4. magnetic separation

Q.

Solid substances are ground with the help of a ___________ in a mortar.

Q.

The branch of electrometallurgy comprises

1. Electrolytic refining

2. Electrolytic extraction

3. Electroplating

4. All of the above

Q. <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Explain the gravity separation method.

Q.

Which of the following statements is true in concentration of ore?

1. Electromagnetic separation is used when both ore and impurities are magnetic in nature.

2. Froth floatation process is based on solubility and is best suited for sulphide ores.

3. Gravity separation also called levigation and particularly suitable for heavy oxides and Carbonate ores.

4. Crushing and grinding of the ore is the physical method to concentrate the ore.

Q. Gravity separation is based on the difference in the ____ of the ore and the gangue particles.

1. solubility
2. density
3. texture
4. magnetic properties

Q.

Gravity separation is also called __

Q. Metallurgy involves steps:-

1. Oxidation of ore
2. Purification
3. Reduction of ore
4. Concentration of ore

Q. Calcination and roasting are pre treatments in metallurgy before metal extraction. Differentiate between calcination and roasting?

Q. <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Explain the gravity separation method.

Q. Gravity separation is based on the difference in the ____ of the ore and the gangue particles.

1. solubility
2. density
3. magnetic properties
4. texture

Q. Gravity separation is also known as ___