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प्रश्न
In the electrolytic method, a layer of highly active metal is applied to a less active metal.
विकल्प
Right
Wrong
उत्तर
In the electrolytic method, a layer of highly active metal is applied to a less active metal- Wrong
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संबंधित प्रश्न
Which of the following pairs will give displacement reactions?
The process by which sulphide ore is concentrated.
Write the composition of the alloy called bronze.
Fill in the following blank with suitable word:
The non-metal present in steel is ............
A zinc ore on heating in air forms sulphur dioxide. Describe briefly any two stages involved in the conversion of this concentrated ore into zinc metal.
Name two metals which are found in nature mainly in the free state (as metallic elements).
Which metal is extracted from cinnabar ore?
Name two ores of zinc. Write the names of the chemical compounds present in them and give their chemical formulae.
The two metals which are extracted by means of electrolytic reduction of their molten salts are:
(a) magnesium and manganese
(b) iron and aluminium
(c) zinc and magnesium
(d) magnesium and aluminium
The articles made of silver metal become dark on prolonged exposure to air. This is due to the formation of a layer of its:
(a) oxide
(b) hydride
(c) sulphide
(d) carbonate
A sulphide ore is converted into metal oxide by the process of:
(a) carbonation
(b) roasting
(c) calcination
(d) anodising
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?
Aluminum is used in thermite welding:
what is thermit?
How an ore is concentrated by froth floatation process?
Complete the incomplete statement with missing word:
Non-metals form acidic oxides while metals form ______.
Name the following:
A compound which is added to lower the fusion temperature of the electrolytic bath in the extraction of aluminium.
Write the molecular formulae of the following compound.
Sodium aluminate
Explain the reactions of nonmetals with water with the help of examples.
Why should the metal sulphides and carbonates be converted to metal oxides in the process of extraction of metal from them?
