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Which among the following is the correct sequence of the elements in earth's crust in decreasing order?

  1. Oxygen > Aluminium > Silicon > Iron
  2. Oxygen > Silicon > Iron > Aluminium
  3. Oxygen > Aluminium > Iron > Silicon
  4. Oxygen > Silicon > Aluminium > Iron

Answer (Detailed Solution Below)

Option 4 : Oxygen > Silicon > Aluminium > Iron

Detailed Solution

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The correct answer is Oxygen > Silicon > Aluminium > Iron.

 Key Points Abundance of the elements in the Earth’s crust:

Elements % by weight
Oxygen (O) 46.6
Silicon (Si) 27.7
Aluminium (Al) 8.1
Iron (Fe) 5.0
Calcium (Ca) 3.6
Sodium (Na) 2.8
Potassium (K) 2.6
Magnesium (Mg) 2.1
All others 1.5
Total 100

 

 

 

 

 

 

 

 

Therefore, the correct answer is Oxygen > Silicon > Aluminium > Iron.

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