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प्रश्न
Name the most abundant metal in the earth's crust.
उत्तर
Aluminium is the most abundant metal in the earth's crust.
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संबंधित प्रश्न
Describe with one example, how moderately reactive metals (which are in the middle of reactivity series) are extracted.
Name two metals which are found in nature mainly in the free state (as metallic elements).
Which metal is extracted from bauxite ore?
Name two ores of zinc. Write the names of the chemical compounds present in them and give their chemical formulae.
Give reasons, why aluminum is used in:
In aluminiothermy
Identify the process given in following passage and draw neat labelled diagram showing the process.
Electrolysis of molten mixture of alumina (melting point > 20000C) is done in a steel tank. The tank has a graphite lining on the inner side. This lining does the work of a cathode. A set of graphite rods dipped in the molten electrolyte works as anode. Cryolite (Na3AlF6) and fluorspar (CaF2) are added in the mixture to lower its melting point upto 10000C.
Answer the following questions based on the extraction of aluminium from alumina by Hall - Heroult’s Process :
Why is powdered coke sprinkled on top of the electrolyte?
Which one of the following is not true of metal :
Metals are good conductors of electricity.
Gold and silver are active metals.
Iqbal treated a lustrous, divalent element M with sodium hydroxide. He observed the formation of bubbles in reaction mixture. He made the same observations when this element was treated with hydrochloric acid. Suggest how can he identify the produced gas. Write chemical equations for both the reactions.
