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Question

Arrange the following elements in the order of their abundance in Earth's crust.

Aluminium - Al, Silicon - Si, Oxygen - O, Iron - Fe.


A
Al>O>Fe>Si
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B
O>Al>Fe>Si
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C
O>Si>Al>Fe
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D
O>Al>Si>Fe
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Solution

The correct option is C O>Si>Al>Fe
Oxygen is the most abundant element in the Earth's crust with 46.6% followed by silicon which contributes 27.7%. Aluminium accounts for 8.1% whereas iron comes fourth at only 5%.

So, the order of abundance is O>Si>Al>Fe


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