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प्रश्न
The given reaction shows one of the processes to extract the metals like Iron and Manganese.
\[\ce{MnO2(s) + Al(s) -> Mn(l) + Al2O3(s) + Heat}\]
Give a reason why Aluminium is preferably used in thermite reactions.
उत्तर
Aluminium is preferably used in thermite reactions as it is placed above Fe and Mn in the reactivity series of metals.
OR
Al is more reactive than Fe/ Mn.
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संबंधित प्रश्न
What iron compound is present in haematite ore? Also write its chemical formula.
Which metal is extracted from cinnabar ore?
Which metal is extracted from calamine ore?
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
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
Give the principles of the froth floatation process.
Give reasons, why aluminum is used in:
In aluminiothermy
Identify the process given in following passage and draw neat labelled diagram showing the process.
Electrolysis of molten mixture of alumina (melting point > 20000C) is done in a steel tank. The tank has a graphite lining on the inner side. This lining does the work of a cathode. A set of graphite rods dipped in the molten electrolyte works as anode. Cryolite (Na3AlF6) and fluorspar (CaF2) are added in the mixture to lower its melting point upto 10000C.
How an ore is concentrated by froth floatation process?
Explain the following reaction with the balanced equation.
Ferric oxide is reacted with aluminium.
