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प्रश्न
Name a metal which occurs free in nature.
उत्तर
Gold
APPEARS IN
संबंधित प्रश्न
Name the process by which impure ore of aluminium gets purified by using the concentrated solution of an alkali.
Complete the statement using every given option.
During the extraction of aluminium..............
Chemical reaction of transformation of bauxite into alumina by Hall’s process.
Give the name and formula of an ore of zinc.:
Roasting of the ore
Arrange the metals:
calcium, iron, magnesium and sodium in order of their reactivity with water placing the most reactive first.
Name an alloy of zinc which is used in simple voltaic cells.
The two main metals in bronze are
Name the following :
An ore of zinc containing its sulphide.
Name the processes involved in dressing of the ores.
Which of the following statements are correct?
(i) A depressant prevents certain type of particle to come to the froth.
(ii) Copper matte contains \[\ce{Cu2S}\] and \[\ce{ZnS}\].
(iii) The solidified copper obtained from reverberatory furnace has blistered appearance due to evolution of \[\ce{SO2}\] during the extraction.
(iv) Zinc can be extracted by self-reduction.
Nickel is purified by thermal decomposition of its:-
