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प्रश्न
Explain concept with example/explain with the help of a balanced equation.
Minerals
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उत्तर
- Most metals being reactive do not occur in nature in the free state but are found in a combined state as their salts such as oxides, carbonates, sulphides, and nitrates.
- However, some unreactive metals like silver, gold, platinum, generally occur in a free state.
- The compounds of metals that occur in nature along with the impurities are called minerals.
- For example, bauxite is a mineral of aluminium.
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संबंधित प्रश्न
Give the importance of the following for living beings:
Nitrogen
Metal A has an electronic configuration of 2, 8, 1 and metal B has 2, 8, 8, 2 which is more reactive metal.
Identify A and B and give their reactions with dil HCL and dil H2SO4 ?
Name:
(b) two metallic oxides which cannot be reduced by carbon, carbon monoxide or hydrogen
On which factors does the purification of metals depend?
With a labelled diagram, explain the electro-refining of a particular metal.
`Cu (OH)2`
................................
`ZnCO_3`
..............................
`2Pb(NO3)_2`
.........................
`2Cu_2O +Cu_2S`
......................
Give the ionization reactions of electrolyte used in Hall’s process. write the reaction at the cathode and the anode. Why the anode has to be replaced in this process?
state the reactions at the two electrodes ?
Why is flux used in the blast furnace?
Distinguish between electrolytic methods of reduction and refining.
The following is a sketch of an electrolytic cell used in the extraction of aluminium :
(a) What is the substance of which the electrode A and B are made?
(b) At which electrode (A or B) is aluminium formed?
(c) What are the two aluminium compounds in the electrolyte C?
(d) Why is it necessary for electrode B to be continuously replaced?
What do you observe when hydrogen is passed over heated copper oxide?
Match the columns.
| Group A | Group B |
| 1. ZnS | a) Copper Sulphide |
| 2. HgS | b) Bauxite |
| c) Cinnabar | |
| d) Zinc blend |
Cassiterite is a copper ore.
Explain the hydraulic separation method with a neat labelled diagram.
Chemical formula of rust is ______
Explain the following term:
Metallurgy
