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Question

The oxidation state of Al in AlCl3 is 


  1. -3

  2. +3

  3. +2

  4. -2


Solution

The correct option is B

+3


In compounds formed by union of metals with non-metals, the metal atoms will have positive oxidation numbers and the non-metals will have negative oxidation numbers. Also, the oxidation number of alkali metals (Li, Na, K etc.) is always +1 and those of alkaline earth metals (Be, Mg, Ca etc) is +2.

Let the oxidation number of Aluminum = n

The halogen atoms being much more electronegative, will have -1 oxidation state each.

n + 3×(-1) = 0
Or n = +3

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