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प्रश्न
The electrolysis of alumina involves the use of fluorspar and cryolite to increase the melting point.
पर्याय
Right
Wrong
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उत्तर
The electrolysis of alumina involves the use of fluorspar and cryolite to increase the melting point- Wrong
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संबंधित प्रश्न
Metallic oxides of zinc, magnesium and copper were heated with the following metals.
| Metal | Zinc | Magnesium | Copper |
| Zinc oxide | – | – | – |
| Magnesium oxide | – | – | – |
| Copper oxide | – | – | – |
In which cases will you find displacement reactions taking place?
Give a reason for the following:
Carbonate and sulphide ores are usually converted into oxides during the process of extraction of metals.
In the extraction of aluminium Write the cathode reaction in electrolytic reduction of alumina.
In the extraction of aluminium: Why is it necessary to replace anodes time to time?
A zinc ore gave CO2 on treatment with a dilute acid. Identify the ore and write its chemical formula.
Explain why, carbon cannot reduce oxides of sodium or magnesium.
Fill in the following blank with suitable word:
The non-metal present in steel is ............
Explain why, an aqueous solution of sodium chloride is not used for the electrolytic extraction of sodium metal.
What iron compound is present in haematite ore? Also write its chemical formula.
Name one ore of sodium. Name the sodium compound present in this ore and write its chemical formula.
The metal which can be extracted from pyrolusite ore is:
(a) mercury
(b) manganese
(c) aluminium
(d) magnesium
Aluminum is used in thermite welding:
what is ignition mixture?
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?
Choose the correct answer from the options given below:
The metal is a liquid at room temperature.
Explain the following reaction with the balanced equation.
Dry aluminium hydroxide is ignited at 1000 °C
Complete flow chart given below.
Explain in brief types of extraction of less reactive metals according to their reactivity.
Oxides of moderately reactive metals like Zinc, Iron, Nickel, Tin, Copper, etc. are reduced by using:
Why should the metal sulphides and carbonates be converted to metal oxides in the process of extraction of metal from them?
Give the reaction involved during extraction of zinc from its ore by
- roasting of zinc ore
- calcination of zinc ore
