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प्रश्न
Iron is _______.
पर्याय
more reactive than zinc
more reactive than aluminium
less reactive than copper
less reactive than aluminium
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उत्तर
Iron is less reactive than aluminium.
APPEARS IN
संबंधित प्रश्न
Name the following:
Main ore of aluminium.
In the extraction of aluminium: Name the process of concentration of bauxite.
Name the following:
The property possessed by metals by which they can be beaten into sheets.
In the extraction of aluminium Write the cathode reaction in electrolytic reduction of alumina.
Why do gold ornaments look new even after several years of use?
Name one metal which is extracted by electrolytic reduction.
Name one metal which is extracted by reduction with heat alone.
Name the electrode at which aluminium metal is produced.
Manganese metal is extracted from manganese dioxide by a reduction process by making use of:
(a) carbon
(b) hydrogen
(c) electrolysis
(d) aluminium
The metal which can be extracted from pyrolusite ore is:
(a) mercury
(b) manganese
(c) aluminium
(d) magnesium
Zinc blende ore can be converted into zinc oxide by the process of:
(a) roasting
(b) hydrogenation
(c) chlorination
(d) calcination
Some metallic oxides can be reduced by hydrogen, carbon and carbon monoxide and some cannot. Explain.
Compare the process of calcination and roasting.
What is passive iron?
Compare the properties of a typical metal and a non- metal on the basis of the following:
(a) electronic configuration
(b) nature of oxides
(c) oxidizing or reducing action
(d) conductivity of heat and electricity
Define calcination.
Bauxite reacts with sodium hydroxide in the Bayer’s process.
Write the molecular formulae of the following compound.
Sodium aluminate
Explain Bayer’s process of concentration of bauxite with a chemical equation.
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.
