The metal which cannot be obtained by electrolysis of aqueous solution of its salts is
The method of one refining of metals is based upon the principle of
Which of the following oxides cannot be converted to metal on heating ?
The slag obtained during the extraction copper from copper pyrites is composed of
Which of the following is not an ore of magnesium ?
Which process is used for the extraction of metals from their sulphide ores?
Which is not employed for refining of metal ?
The process by which lighter earthly particles are freed from the heavier particles by washing with water is called
Heating pyrites to remove sulphur is called
Give the correct order of initials T or F for following statements. Use T if statement is true and F if it is false.
I. Every mineral is an ore but every ore is not a mineral.
II. Slag is product formed during extraction of metal by combination of flux and impurities.
III. Highly pure metals can be obtained by zone refining.
IV. Carnallite is an ore of magnesium and sodium.
Which of the following statements about the advantage of roasting of sulphide ore before reduction is not true ?
Auto reduction process is used in the extraction of
Among the following groups of oxides, the group that cannot be reduced by carbon to give the respective
Froth floatation process for the concentration of ores is an illustration of the practical application of
Refining of silver is done by
Which of the following process is used in the extractive metallurgy of magnesium ?
Which of the following is used in extractive metallurgy of silver ?
In electrorefining of copper, some gold is deposited as
Aluminium is extracted from alumina (Al2O3) by electrolysis of a molten mixture of
Which of the following statements, regarding the advantage of roasting of sulphide ore before reduction
is not true ?