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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
In the extraction of aluminium: Name the process of concentration of bauxite.
M is a metal above hydrogen in the activity series and its oxide has the formula M2O. This oxide when dissolved in water forms the corresponding hydroxide which is a good conductor of electricity. In the above context, answer the following:
1) What kind of combination exists between M and O?
2)How many electrons are there in the outermost shell of M?
3) Name the group to which M belongs.
4) State the reaction taking place at the cathode.
5) Name the product at the anode.
Name one metal which is extracted by reduction with aluminium.
Explain given equation, what happens when ZnCO3 is heated in the absence of air?
What iron compound is present in haematite ore? Also write its chemical formula.
What is the difference between a mineral and an ore?
Name one ore of sodium. Name the sodium compound present in this ore and write its chemical formula.
The metal which is always present in an amalgam is:
(a) iron
(b) aluminium
(c) mercury
(d) magnesium
Rock salt is an ore of one of the following metals. This metal is:
(a) Mn
(b) Na
(c) Fe
(d) Cu
Which metal can be extracted from the following ore?
bauxite
Define the following term.
Mineral
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?
Complete the incomplete statement with missing word:
Non-metals form acidic oxides while metals form ______.
State the property of the metal being utilized in the following :
| Use of metal | Property |
| Zinc in Galvanization | |
| Aluminium in Thermite welding |
Which one of the following is not true of metal :
Metals are good conductors of electricity.
Heating an ore in a limited supply of air or in the absence of air at a temperature just below its melting point is known as ______.
Observe the given figure of reactivity series of metals and answer the following questions:
Reactivity series of metals
- Name two metals which react with water.
- Name two moderately reactive metals.
- Name the most highly reactive metal and the most less reactive metal.
Iron is _______.
Bauxite reacts with sodium hydroxide in the Bayer’s process.
Explain the following reaction with the balanced equation.
Chlorine dissolved in water
