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प्रश्न
Name the following:
A compound which is added to lower the fusion temperature of the electrolytic bath in the extraction of aluminium.
उत्तर
Cryolite
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संबंधित प्रश्न
In the extraction of aluminium Write the cathode reaction in electrolytic reduction of alumina.
Describe with one example, how moderately reactive metals (which are in the middle of reactivity series) are extracted.
Name the gas produced when calamine ore is calcined.
Give reasons, why aluminum is used in:
painting electric and telegraphic poles
Answer the following questions based on the extraction of aluminium from alumina by Hall - Heroult’s Process :
Name the electrode, from which aluminium collected.
In the electrolytic method, a layer of highly active metal is applied to a less active metal.
Write the molecular formulae of the following compound.
Cryolite
Explain the following reaction with the balanced equation.
Dry aluminium hydroxide is ignited at 1000 °C
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.
- Given below are the steps for extraction of copper from its ore. Write the reaction involved.
- Roasting of copper (I) sulphide
- Reduction of copper (I) oxide with copper (I) sulphide.
- Electrolytic refining
- Draw a neat and well labelled diagram for electrolytic refining of copper
