Advertisements
Advertisements
प्रश्न
Explain concept with example/explain with the help of a balanced equation.
Roasting
Advertisements
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.
\[\ce{\underset{\text{Zinc sulphide}}{2ZnS_{(s)}} + 3O_{2(g)} -> \underset{\text{Zinc oxide}}{2ZnO_{(s)}} + \underset{\text{Sulphur dioxide}}{2SO_2↑}}\]
APPEARS IN
संबंधित प्रश्न
In the extraction of aluminium: Name the process of concentration of bauxite.
Which metal becomes black in the presence of hydrogen sulphide gas in air?
Name the gas in air which tarnishes silver articles slowly.
Name one metal which is extracted by:
Reduction with aluminium.
Name the metal which is extracted from haematite ore.
Describe the extraction of zinc metal from its sulphide ore (zinc blende). Write equations of the reactions involved.
The two metals which are extracted by means of electrolytic reduction of their molten salts are ______.
Which of the following pair of metals exists in their native state in nature?
Which of the following metals are extracted by the electrolysis of their molten chlorides?
Metals X and Y can be recovered from the anode mud left behind after the electrolytic refining of copper metal. The coins made of metal X look new even after several years of use but the coins made of metal Y lose their shine gradually and get blackened soon. When metal X is alloyed with a small amount of metal Y, it becomes hard and hence suitable for making ornaments. What are metals X and Y? Also state the colour of metal X.
Which metal can be extracted from the following ore?
Haematite
Give the principles of electromagnetic separation.
Which one of the following is not true of metal :
Metals form non-polar covalent compounds
Zinc sulphide : Roasting : : zinc carbonate : _______
Write the name.
Extraction of aluminium from alumina-
Explain the characteristics of ionic compounds.
Which of the statements about the reaction, \[\ce{ZnO + CO -> Zn + CO2}\] is correct?
In extraction of copper, the flux used is ____________.
Which of the following metals exist in their native state in nature?
(i) Cu
(ii) Au
(iii) Zn
(iv) Ag
Care must be taken while diluting concentrated nitric acid with water. Why?
