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प्रश्न
What are the differences between minerals and ores?
उत्तर
Minerals:
- Minerals contain a low percentage of metal.
- Metal cannot be extracted easily from minerals.
- Clay \[\ce{Al2O3.SiO2.2H2O}\] is the mineral of aluminium.
Ores:
- Ores contain a large percentage of metal.
- Ores can be used for the extraction of metals on a large scale readily and economically.
- Bauxite \[\ce{Al2O3.2H2O}\] is the ore of aluminium.
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संबंधित प्रश्न
The process of leaching alumina, using sodium carbonate is called
- Bayer's process
- Decomposition
- Cyanide process
- Hall's process
Fe2O3 is reduced to spongy iron near the top of blast furance by
(A) H2
(B) CaO
(C) SiO2
(D) CO
What is the role of silica in the extraction of copper?
Define Leaching.
Draw a neat, well labelled diagram of electrolytic cell for extraction of aluminium
What is the role of the following compound-
SiO2 in the extraction of copper from copper pyrites?
In the extraction of zinc from zinc blende:
(i) Give an equation to show how zinc oxide is converted to zinc.
(ii) How is impure zinc finally electro-refined?
What happens when a nickel rod is dipped into a copper sulphate solution? Justify your answer.
`[E_((Ni^(+2))/(Ni))^0 = -0.25"v" and E _(("Cu"^(+2))/("Cu"))^0 = +0.34"v"]`
In the extraction of aluminium by Hall-Heroult process, purified \[\ce{Al2O3}\] is mixed with \[\ce{CaF2}\] to:
(i) lower the melting point of \[\ce{Al2O3}\].
(ii) increase the conductivity of molten mixture.
(iii) reduce \[\ce{Al^{3+}}\] into \[\ce{Al(s)}\].
(iv) acts as catalyst.
Metal always found in Free State is
