Advertisements
Advertisements
प्रश्न
Which of the following reactants are used to carry out the thermite reaction required for welding the broken railway tracks?
(a) Al2O3 + Fe
(b) MnO2 + Al
(c) Fe2O3 + Al
(d) Cu2O + Fe
उत्तर
(c) Fe2O3 + Al
In this thermite reaction, iron (III) oxide and aluminium powder are combined and heated. Iron oxide gets reduced to iron by the action of reducing agent aluminium and produces excess heat. The molten iron produced is poured in the middle of the broken pieces of irons that are fixed mutually.
APPEARS IN
संबंधित प्रश्न
How are the less reactive metals (which are quite low in the reactivity series) extracted? Explain with the help of an example.
Explain given equation, what happens when ZnCO3 is heated in the absence of air?
The major ore of aluminium is known as:
(a) cinnabar
(b) calamine
(c) bauxite
(d) pyrolusite
Which of the following metals are extracted by the electrolysis of their molten chlorides?
(a) Na and Hg
(b) Hg and Mg
(c) Na and Mg
(d) Cu and Fe
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?
Give the chemical formula of :
Bauxite
Name the following:
The process of heating a substance very strongly in such a way that it does not combine with oxygen.
In electrolytic reduction of alumina _______ is used as a cathode.
Explain the following reaction with the balanced equation.
Chlorine dissolved in water
