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प्रश्न
Explain concept with example/explain with the help of a balanced equation.
Roasting
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उत्तर
- The process of heating of sulphide ores strongly in excess of air to convert it into respective oxide is called roasting.
- For example, zinc sulphide is heated strongly in excess of air to convert it to zinc oxide.
\[\ce{\underset{\text{Zinc sulphide}}{2ZnS_{(s)}} + 3O_{2(g)} -> \underset{\text{Zinc oxide}}{2ZnO_{(s)}} + \underset{\text{Sulphur dioxide}}{2SO_2↑}}\]
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संबंधित प्रश्न
Give reasons.
Aluminium is a highly reactive metal, yet it is used to make utensils for cooking.
Name one metal which is extracted by reduction with aluminium.
How are the less reactive metals (which are quite low in the reactivity series) extracted? Explain with the help of an example.
Define the term ore.
An important ore of zinc metal is:
(a) calamine
(b) cuprite
(c) pyrolusite
(d) haematite
The metal which is always present in an amalgam is:
(a) iron
(b) aluminium
(c) mercury
(d) magnesium
Calamine ore can be converted into zinc oxide by the process of:
(a) dehydration
(b) roasting
(c) calcination
(d) sulphonation
State why aluminium is extracted from its oxide by electrolysis while copper, lead, iron by reducing agents and mercury and silver by thermal decomposition.
Give reasons, why aluminum is used in:
making alloys
Complete the incomplete statement with missing word:
Non-metals form acidic oxides while metals form ______.
Write the name.
The process of extraction of aluminium from alumina-
Write the molecular formulae of the following compound.
Cryolite
Write the molecular formulae of the following compound.
Fluorspar
Explain the concept of Roasting.
Explain in brief types of extraction of moderately reactive metals according to their reactivity.
Oxides of moderately reactive metals like Zinc, Iron, Nickel, Tin, Copper, etc. are reduced by using:
In extraction of copper, the flux used is ____________.
Why should the metal sulphides and carbonates be converted to metal oxides in the process of extraction of metal from them?
Assertion (A): The extraction of metals from their sulphide ores cannot take place without roasting the ore.
Reason (R): Roasting converts sulphide ores directly into metals.
