HARDMCQ SINGLEIChO (Chemistry Olympiad)Inorganic Chemistryp-Block (group 13 and 14)Achiever Section
Which one of the following metals cannot be extracted by using Al as a reducing agent?
A.Na from Na₂O✓ Correct
B.Cr from Cr₂O₃
C.W from WO₃
D.Mn from Mn₃O₄
Explanation
Thermite mixture consists of 2 3 M O Al + (powder) is used in the welding, where M is the metal. Generally, aluminium metal used here is for the reduction of metal oxide to corresponding metal. Sodium metal is more re- active than aluminium. Therefore, it cannot be reduced.
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