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प्रश्न
State three objectives achieved during the roasting of ores.
उत्तर
- It removes moisture from ores.
- It makes the ore porous and more reactive.
- It expels volatile impurities.
- It converts sulphide ores into oxides.
संबंधित प्रश्न
What chemical process is used for obtaining a metal from its oxide?
The two metals which can be extracted just by heating their sulphides in air are:
(a) sodium and copper
(b) copper and aluminium
(c) potassium and zinc
(d) mercury and copper
The major ore of aluminium is known as:
(a) cinnabar
(b) calamine
(c) bauxite
(d) pyrolusite
The metal which can be extracted simply by heating the cinnabar ore in air is:
(a) Zn
(b) Cu
(c) Al
(d) Hg
An element has its electron configuration as 2,8,8,2. Now answer the following questions.
a) What is the atomic number of this element?
b) What is the group of this element?
c) To which period does this element belong?
How an ore is concentrated by froth floatation process?
Complete the incomplete statement with missing word:
Non-metals form acidic oxides while metals form ______.
Extraction of moderately reactive elements is done by _______ and _______ method.
Write the molecular formulae of the following compound.
Fluorspar
The given reaction shows one of the processes to extract the metals like Iron and Manganese.
\[\ce{MnO2(s) + Al(s) -> Mn(l) + Al2O3(s) + Heat}\]
Give the reason why the above reaction is known as a thermite reaction.
