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प्रश्न
Bauxite reacts with sodium hydroxide in the Bayer’s process.
पर्याय
Right
Wrong
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उत्तर
Bauxite reacts with sodium hydroxide in the Bayer’s process- Right
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संबंधित प्रश्न
Name a reducing agent that may be used to obtain manganese from manganese dioxide.
Which metal becomes black in the presence of hydrogen sulphide gas in air?
Name one metal which is extracted by:
Reduction with heat alone.
How are the less reactive metals (which are quite low in the reactivity series) extracted? Explain with the help of an example.
Explain why, an aqueous solution of sodium chloride is not used for the electrolytic extraction of sodium metal.
Name the gas produced when calamine ore is calcined.
How is sodium metal extracted? Explain with the help of equation of the reaction involved.
An ore of manganese metal is ______.
The metal which can be extracted simply by heating the cinnabar ore in air is ______.
A metal which exists as a liquid at room temperature is obtained by heating its sulphide ore in the presence of air.
- Name the metal and write its chemical symbol.
- Write the name and formula of the sulphide ore.
- Give the equations of chemical reactions involved in the production of metal from its sulphide ore.
- Name a common device in which this metal is used.
- Can this metal displace copper from copper sulphate solution? Why?
Give reasons, why aluminum is used in:
In making ships
Aluminum is used in thermite welding:
what is thermit?
Name the ore of mercury. With the help of balanced chemical equations, explain the process of extraction of mercury from its ore.
Complete the incomplete statement with missing word:
Metals form positive ions while non- metals ______.
To protect iron from rusting, it is coated with a thin layer of zinc. Name the process.
Choose the correct answer from the options given below:
The metal is a liquid at room temperature.
In the electrolytic reduction of alumina, the lining of graphite acts as an anode.
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
On the basis of reactivity metals are grouped into three categories:
- Metals of low reactivity
- Metals of medium reactivity
- Metals of high reactivity
Therefore metals are extracted in pure form from their ores on the basis of their chemical properties.
Metals of high reactivity are extracted from their ores by electrolysis of the molten ore.
Metals of low reactivity are extracted from their sulphide ores, which are converted into their oxides. The oxides of these metals are reduced to metals by simple heating.
(a) Name the process of reduction used for a metal that gives vigorous reaction with air and water both.
(b) Carbon cannot be used as a reducing agent to obtain aluminium from its oxide? Why?
(c) Describe briefly the method to obtain mercury from cinnabar. Write the chemical equation for the reactions involved in the process.
OR
(c) Differentiate between roasting and calcination giving chemical equation for each.
Assertion (A): The extraction of metals from their sulphide ores cannot take place without roasting the ore.
Reason (R): Roasting converts sulphide ores directly into metals.
