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प्रश्न
The electrolysis of alumina involves the use of fluorspar and cryolite to increase the melting point.
विकल्प
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
Write the steps involved in the extraction of pure metals in the middle of the activity series from their carbonate ores.
In the extraction of aluminium: Write the function and formula of cryolite in the extraction of aluminium.
Silver metal does not combine easily with oxygen but silver jewellery tarnishes after some time. How?
Explain given equation, what happens when ZnCO3 is heated in the absence of air?
Name the chemical compound which is electrolysed in molten state to obtain sodium metal. Which gas is produced in this process?
An ore of manganese metal is:
(a) bauxite
(b) haematite
(c) cuprite
(d) pyrolusite
Calamine ore can be used to extract one of the following metals. This metal is:
(a) copper
(b) mercury
(c) aluminium
(d) zinc
Which of the following reactants are used to carry out the thermite reaction required for welding the broken railway tracks?
(a) Al2O3 + Fe
(b) MnO2 + Al
(c) Fe2O3 + Al
(d) Cu2O + Fe
Zinc blende ore can be converted into zinc oxide by the process of:
(a) roasting
(b) hydrogenation
(c) chlorination
(d) calcination
Give reasons, why aluminum is used in:
In aluminiothermy
Name the anode, the cathode and the electrolyte used in the electrolytic refining of impure copper.
Write equations for each of the above metal which reacts with water.
How many valence electrons are present in metals ?
Calcium, copper, lead, aluminium, zinc, chromium, magnesium, iron.
Choose the major metals from the list given above to make the following alloys:
(a) Stainless steel
(b) brass
Zinc blende is converted to oxide by ______ process.
In the electrolytic reduction of alumina, the lining of graphite acts as an anode.
Explain the reactions of nonmetals with water with the help of examples.
Explain in brief types of extraction of highly reactive metals according to their reactivity.
Which of the statements about the reaction, \[\ce{ZnO + CO -> Zn + CO2}\] is correct?
Two ores A and B were taken. On heating ore A gives CO2 whereas, ore B gives SO2. What steps will you take to convert them into metals?
