MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Inorganic Chemistryp-Block (group 13 and 14)Aluminium and Its Compounds

Al₂O₃ formation from aluminium and oxygen involves evolution of a large quantity of heat, which makes alu- minium used in:

A.deoxidiser

B.confectionary

C.indoor photography

D.thermite welding✓ Correct

Explanation

Aluminum reacts with oxygen to form aluminium oxide ( 2 3 Al O ) and releases large quantities of heat. It makes aluminium to use in thermite welding to join two railway tracks. 2 3 2 3 Fe O 2Al Al O 2Fe 850kJmol- + ® + +

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