Concentration of Ore

Q.

What is electrolytic decomposition? Give two uses of an electrolytic decomposition reaction.

Q. the gibbs enegy for the decomposition of Al2O3 at 500 is as folows 2/3 Al2o3→4/3Al +O2 △ G=960 the potential difference needed for electrolytic reduction of al2o3 is HOW TO FIND n

Q.

Experimentally it was found that a metal oxide has a formula of M0.98 . Metal M is present as M^+2 and M^+3 in its oxide. Fraction of the metal which exists as M^+3 would be ?

Options -----

(A) 4.08 percentage

(B) 6.05 percentage

(C) 5.08 percentage

(D) 7.01 percentage

Q.

Define bessemerisation?

Q. Galena (an ore) is parrtially oxidized by passing air through it at high temperature. After some time, the passage of air is stopped, but the heating is continued in a closed furnace such that the contents undergo self-reduction. The weight (in kg) of Pb produced per kg of $O_2$ consumed is

Q. In electrolysis of water why is oxygen released at anode?

Q.

The reaction between Fe₂O₃ and carbon produces_______ and__________.

Q. Which of the following is used as an electrolyte in an $H_2-O_2$ fuel cell?

1. $Cu(OH{)}_3$
2. $KOH$
3. $Fe(OH{)}_2$
4. $N{H}_{4}OH$

Q. Which one of the following is not a method of concentration of ore?

1. Electromagnetic separation
2. Smelting
3. Gravity separation
4. Froth floatation process

Q. Find the number of compounds that form basic flux from the ones given below:
$Si{O}_2,MgO,CaO,FeO,B_2{O}_3,CaC{O}_3$

Q.

Calamine is the ore of

1. Copper

2. Zinc

3. Aluminium

4. Iron

Q. Explain blast and reverberatoy furnace and their differences

Q. Consider the given compounds and ores

$\begin{array}{cccc}1.& \text{Sphalerite}& \left(p\right)& FeC{O}_3\\ 2.& \text{Calamine}& \left(q\right)& ZnS\\ 3.& \text{Malachite}& \left(r\right)& CuC{O}_3.Cu(OH{)}_2\\ 4.& \text{Siderite}& \left(s\right)& ZnC{O}_3\end{array}$
The correct mtch among the following is

1. 1 2 3 4
   q p r s
2. 1 2 3 4
   q s r p
3. 1 2 3 4
   s q p r
4. 1 2 3 4
   r s q p

Q. What are the features of an ore ?

Q.

All minerals are ores and can be used for the extraction of metals.

1. True
2. False

Q.

Which of the following methods are employed in the extraction of tin from cassiterite?

1. Froth floatation

2. Magnetic Separation

3. Levigation or Gravity Separation

4. All of the above

Q.

Identify the method used to separate ore from gangue by preferential wetting.

Q.

Aluminium is used in thermite welding because

1. It is a strong oxidizing agent

2. It is a reactive metal

3. It is a light metal

4. It has more affinity for oxygen

Q. Borax bead test is responded by:

1. divalent metals
2. heavy metals
3. metals which form coloured metaborates
4. light metal

Q. (a) Write the principle of electrolytic refining.
(b) Why does copper obtained in the extraction from copper pyrites have a blistered appearance?
(c) What is the role of depressants in the froth floatation process?

Q. Mention pinacole pinacolon reaction mechanism in the following parts

Q. During electrolysis, electrons are being added directly to the metal ions at the ___________.

1. anode
2. none of the above
3. both $A$ and $B$
4. cathode

Q. The extraction of metals from oxide ores involve :

1. reduction with carbon
2. reduction with aluminium
3. electrolyte reduction
4. reduction with $CO$

Q. Among the fluorides below, the ore which does not exists is

1. 
2. 
3. 
4. 

Q. Ores of elements like iron, zinc etc​ can be extracted by

1. Pyrometallurgy​
2. Hydrometallurgy​
3. Electrometallurgy​
4. None of the above

Q. the native Ag forms a water soluble compound B with dilute aqueous solution of NaCN in the presence of a gas A the Ag metal is obtained by the addition of a metal C to B and complex D is formed as a by product write the structures of C and D and identify A and B in the following sequence; Ag+NaCN+H2O+A=B+OH+Na .[C]+[B]=[D]=Ag

Q. Minerals from which metals can be preferably extracted are called :

1. Ores
2. Source
3. Alloy
4. None of these

Q. For getting 1kg of Aluminium how many kg of carbon anode is burnt away in the metallurgy of Aluminium explain with the help of reaction.

Q.

Composition of Siderite is

1. FeS₂

2. FeCO₃

3. Fe₃O₄

4. Fe₂O₃

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

1. True
2. False