Concentration of Ore

Q.

The formula for Zinc-Blende is ________ .

1. $ZnSO$

2. $ZnS$

3. $ZnSAl$

4. $ZnC{O}_3$

Q. During calcination, zinc carbonate decomposes to release gas.

1. oxygen
2. carbon dioxide
3. hydrogen

Q. Raw materials used in the preparation of glass are:

1. $Sand\left(Si{O}_2\right)$
2. $Sodaash\left(N{a}_{2}C{O}_3\right)$
3. $Limestone\left(CaC{O}_3\right)$
4. $NaC{O}_2$

Q.

What is ore enrichment? Is it different for different for different types of ores?

Q. What are the uses of electrolytic decomposition reaction?

Q.

What is a concentration of ores?

Q.

What are the oxidation numbers of copper? Give examples.

Q.

The metal oxide is yellow when hot and white when cold.The metal oxide is

Q. The process of froth floatation is based on the difference in ______ of ore and gangue.

1. interaction with reagent
2. wettability
3. magnetic properties
4. densities

Q.

What is the scientific name of baking soda?

Q.

The oxidation state of $\mathrm{Cu}$ and $\mathrm{Fe}$in Copper Pyrites is :

1. $+1\text{and}+2$

2. $+1\text{and}+3$

3. $+2\text{and}+6$

4. $+2\text{and}+3$

Q. Question 24
During electrolytic refining of zinc, it gets:
(a) deposited on cathode.
(b) deposited on anode.
(c) deposited on cathode as well as anode.
(d) remains in the solution.

Q.

Name:

(a) the processes involved in

(i) concentration (ii) refining of ores.

(b) two metallic oxides which cannot be reduced by carbon, carbon monoxide or hydrogen.

Q.

Name the type of reaction involved in black and white photography.

Q.

___ is a byproduct of coal used in the extraction of metals.

Q.

The method used for refining impure metals is called:

1. Electrolytic Refining

2. Electrolytic reduction

3. Calcination

4. Corrosion

Q. Pure metals are obtained by process

1. Leaching
2. Separation
3. Refining

Q. what is the sign for reaction taking electricity for decomposition of compound like for heat is triangle , for photolysis it is h new than for electrolytic it is what

Q. What is anodizing of aluminium?

Q.

The first step for the extraction of metals in metallurgy is

1. concentration of ore

2. extraction of metal from concentrated ore

3. refining of metals

4. reduction of metal oxide

Q.

Is zinc oxide safe for the skin?

Q.

Match the following metals with their respective ores:

1. Aluminium- Zinc Blende
   Zinc- Bauxite
   Iron- Haematite
2. Aluminium- Bauxite
   Zinc- Haematite
   Iron- Zinc Blende
3. Aluminium- Bauxite
   Zinc- Zinc Blende
   Iron- Haematite

Q.

The impurities present in mined ore are technically called

1. Matrix

2. Slag

3. Waste

4. Gangue

Q.

Explain why the metals like Na, K, Ca, and Mg are never found in their free state in nature?

Q.

The impurities present in a crude ore is called gangue.

1. True

2. False

Q.

The substance which is added to the ore to convert non-fusible (i) …… to a fusible compound is called (ii) ……

Q.

During the manufacture of wrought iron, cast iron is taken in a reverberatory furnace and stirred at high temperature and this process is called ?

Q.

Ellingham diagram is used for

1. Reduction

2. Electrolysis

3. Zone refining

4. Van Arkel

Q. _____ method is used to concentrate cassiterite ore.

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

Q.

Concentration is also called “Ore dressing” or “Benefaction”.

1. True

2. False