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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
Name the following:
The property possessed by metals by which they can be beaten into sheets.
In the extraction of aluminium: Write the function and formula of cryolite in the extraction of aluminium.
Name the gas in air which tarnishes silver articles slowly.
Write the composition of the alloy called bronze.
Define the term ore.
Which gas is produced during the extraction of aluminium? At which electrode is this gas produced?
A metal which exists as a liquid at room temperature is obtained by heating its sulphide ore in the presence of air.
(a) Name the metal and write its chemical symbol.
(b) Write the name and formula of the sulphide ore.
(c) Give the equations of chemical reactions involved in the production of metal from its sulphide ore.
(d) Name a common device in which this metal is used.
(e) Can this metal displace copper from copper sulphate solution? Why?
Give reasons, why aluminum is used in:
wrapping chocolates
Give reasons, why aluminum is used in:
In making ships
Name the anode, the cathode and the electrolyte used in the electrolytic refining of impure copper.
Define the following term.
Gangue
Give the chemical formula of :
Sodium aluminate
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 ______.
Define roasting.
In Electrolytic reduction of alumina, Anode : _______ : : Cathode : Graphite lining
Zinc sulphide : Roasting : : zinc carbonate : _______
Write the molecular formulae of the following compound.
Cryolite
Write the molecular formulae of the following compound.
Fluorspar
Read the following passage and answer the questions.
According to the reactivity series, zinc is more reactive than iron, iron is more reactive than silver. During study of this, a student dipped the iron nails in silver nitrate solution.
- What is reactivity series?
- What will happen when iron nails are dipped in silver nitrate solution?
- Which type of reaction happens when iron metal reacts with silver nitrate solution?
- What will happen if a zinc rod is used instead of iron nail?
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
