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प्रश्न
Which of the following statements are correct?
(i) A depressant prevents certain type of particle to come to the froth.
(ii) Copper matte contains \[\ce{Cu2S}\] and \[\ce{ZnS}\].
(iii) The solidified copper obtained from reverberatory furnace has blistered appearance due to evolution of \[\ce{SO2}\] during the extraction.
(iv) Zinc can be extracted by self-reduction.
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उत्तर
(i) A depressant prevents certain type of particle to come to the froth.
(iii) The solidified copper obtained from reverberatory furnace has blistered appearance due to evolution of \[\ce{SO2}\] during the extraction.
Explanation:
Depressants can prevent frothing of a particular sulphide. The solidified copper obtained in reverberatory furnace has blistered appearance hence it is called blister copper.
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संबंधित प्रश्न
Choose the correct answer from the options given below:
The main ore used for the extraction of iron is
A. Haematite
B. Calamine
C. Bauxite
D. Cryolite
The most common ore of iron is ________. (Calcium / Haematite)
Name the most common ore of the metal aluminium from which the metal is extracted. Write the chemical formula of the ore.
What is rust? Give the equation for the formation of rust ?
Also give the names of their repective ores ?
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Name an ore which is concentrated by:
forth floatation process
State the use of:
cast iron
State the use of:
Mild steel,
Complete the statement using every given option.
During the extraction of aluminium..............
Use of leaching during the concentration of ore.
Name the following :
Ore of iron referred to as "fool's gold".
Name the following:
The kind of welding in which aluminium powder is used.
Comment on the statement that - “All ores are minerals but all minerals are not ores”.
What is an amalgam? Name one metal which does not form amalgam? State one use of amalgam.
The following question refer to the extraction of aluminium and iron from their ores:
What is the major impurity present in iron when it is removed from the furnace?
Find the odd one out of the following and explain your choice.
Sulphur, Phosphorous, Carbon, Iodine
| X | Y | |
| Normal Electronic Configuration | 2, 8, 7 | 2, 8, 2 |
| Nature of Oxide | Dissolves in water and truns blue litmus red. | Very low solubility in water. Dissolves in hydrochloric acid. |
| Tendency for Oxidising and reducing reactions | Tends to oxidise elements and compound. | Tends to act as a reducing agent. |
| Electrical and Thermal Conductivity | Very poor electrical conductor. Poor thermal conductivity. |
Good electrical conductor. Good thermal conductor. |
| Tendency to form Alloys and Amalgams | No tendency to form alloys. | Forms alloys. |
Using the information above, complete the following:
- _________ is the metallic element.
- Metal atoms tend to have a maximum of ________ electrons in the outermost energy level.
- Non-metallic elements tend to form _________ oxides while metals tend to form _______ oxides.
- Non-metallic elements tend to be ______ conductors of heat and electricity.
- Metals tend to _______ electrons and act as ________ agents in their reactions with elements and compounds.
Name the following.
The property possessed by metals by which they can be beaten into sheets.
Explain concept with example/explain with the help of a balanced equation.
Ores
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