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प्रश्न
Define the following term.
Mineral
उत्तर
Most of the elements occur in nature as in combined state as minerals. The chemical composition of minerals is fixed.
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संबंधित प्रश्न
Name the following: Main ore of aluminium.
Define the Ore.
Explain why, carbon cannot reduce oxides of sodium or magnesium.
Which one of the methods given in column I is applied for the extraction of each of the metals given in column II:
| Column I | Column II |
| Electrolytic reduction | Aluminium |
| Reduction with Carbon | Zinc |
| Reduction with Aluminium | Sodium |
| Iron | |
| Manganese | |
| Tin |
Explain giving one example, how highly reactive metals (which are high up in the reactivity series) are extracted.
Name one ore of copper (other than cuprite). Which compound of copper is present in this ore? Also, write its chemical formula.
The major ore of aluminium is known as:
(a) cinnabar
(b) calamine
(c) bauxite
(d) pyrolusite
The two metals which are extracted by means of electrolytic reduction of their molten salts are:
(a) magnesium and manganese
(b) iron and aluminium
(c) zinc and magnesium
(d) magnesium and aluminium
During galvanisation, iron metal is given a thin coating of one of the following metals. This metal is:
(a) chromium
(b) tin
(c) zinc
(d) copper
Give reasons, why aluminum is used in:
In aluminiothermy
Name the following:
Two metals which are found in the free or native state.
Name the following:
The process of heating a substance very strongly in such a way that it does not combine with oxygen.
How an ore is concentrated by froth floatation process?
What is passive iron?
Complete the incomplete statement with missing word:
Metals are malleable while non-metals are ______.
Answer the following question :
What is the difference between calcination and roasting.
Write the name.
The process of extraction of aluminium from alumina-
Explain in brief electrolytic reduction of alumina with a neat labelled diagram.
Explain the difference between Bayer’s process and Hall’s process by explaining the Bayer’s process.
Why should the metal sulphides and carbonates be converted to metal oxides in the process of extraction of metal from them?
