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प्रश्न
The electrolysis of alumina involves the use of fluorspar and cryolite to increase the melting point.
विकल्प
Right
Wrong
उत्तर
The electrolysis of alumina involves the use of fluorspar and cryolite to increase the melting point- Wrong
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संबंधित प्रश्न
Why are the metals like Na, K, Ca and Mg never found in their free state in nature?
Name one metal which is extracted by reduction with aluminium.
Fill in the following blank with suitable word:
The rocky material found with ores is called.............
Name two ores of zinc. Write the names of the chemical compounds present in them and give their chemical formulae.
Which metal can be extracted from the following ore?
Haematite
State why aluminium is extracted from its oxide by electrolysis while copper, lead, iron by reducing agents and mercury and silver by thermal decomposition.
State one observation for each of the following :
Copper sulphate solution is electrolysed using copper electrodes.
Answer the following questions based on the extraction of aluminium from alumina by Hall - Heroult’s Process :
What is the function of cryolite used along with alumina as the electrolyte?
Name the following:
The substance added to get rid of gangue in the extraction of metal.
Which method of refining is used to get 99.8% pure aluminium?
How many valence electrons are present in non- metals?
choose the most appropriate term to match the given description.
Heating of the ore in the absence of air to high temperature
Zinc blende is converted to oxide by ______ process.
What is the difference between calcination and roasting?
Explain the concept of Calcination.
Explain the reactions of nonmetals with water with the help of examples.
Explain in brief types of extraction of moderately reactive metals according to their reactivity.
Explain in brief electrolytic reduction of alumina with a neat labelled diagram.
2 mL each of concentrated HCl, HNO3 and a mixture of concentrated HCl and concentrated HNO3 in the ratio of 3 : 1 were taken in test tubes labelled as A, B and C. A small piece of metal was put in each test tube. No change occurred in test tubes A and B but the metal got dissolved in test tube C respectively. The metal could be
