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Question

Arrange the following major elements present in the Earth's crust, in ascending order, in weight percentage :
1. Aluminium
2. Calcium
3. Silicon
4. Oxygen
Select the answer using the code given below :

This question was previously asked in
CDS 2 2025 Maths Question Paper (14-Sep-2025)
The correct answer is
2, 1, 3, 4

Earth's Crust Elements: Weight Percentage Order

This question asks us to arrange four major elements found in the Earth's crust—Aluminium, Calcium, Silicon, and Oxygen—based on their weight percentage, from the smallest percentage to the largest (ascending order). Understanding the composition of the Earth's crust is key to solving this.

Major Elements in Earth's Crust

The Earth's crust is primarily composed of several elements. The abundance varies significantly among them. Here are the approximate weight percentages for the elements mentioned in the question:

Element Name Symbol Approximate Weight Percentage (%)
Oxygen O 46.6
Silicon Si 27.7
Aluminium Al 8.1
Calcium Ca 3.6

Weight Percentage Ranking of Elements

Now, let's arrange these elements based on their weight percentages in ascending order (from lowest to highest):

  • Lowest Percentage: Calcium (Ca) at approximately \(3.6\%\)
  • Next Lowest: Aluminium (Al) at approximately \(8.1\%\)
  • Next: Silicon (Si) at approximately \(27.7\%\)
  • Highest Percentage: Oxygen (O) at approximately \(46.6\%\)

The question assigns numbers to these elements:

  • 1. Aluminium
  • 2. Calcium
  • 3. Silicon
  • 4. Oxygen

Translating the ascending order of elements (Calcium, Aluminium, Silicon, Oxygen) into their corresponding numbers gives us the sequence: 2, 1, 3, 4.

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