Question
Decreasing order of elements as per their average composition in earth crust (% by weight) is :
A. Al3+
B. Fe2+
C. Si4+
D. Ca2+
E. Na+
Choose the correct answer from the options given below :
This question was previously asked in
CUET PG 2026 Agri-Business Management Question Paper (25-Mar-2026) (Shift 2)
The correct answer is
C, A, B, D, E
Element Abundance Ranking in Earth's Crust
The question requires ordering specific elements by their average weight percentage in the Earth's crust, from highest to lowest. The ionic charges provided do not affect the elemental abundance percentages.
Key elements and their approximate average composition by weight in the Earth's crust are:
| Element | Symbol (Option) | Approx. % by Weight |
| Silicon | C ($Si^{4+}$) | ~27.7% |
| Aluminum | A ($Al^{3+}$) | ~8.1% |
| Iron | B ($Fe^{2+}$) | ~5.0% |
| Calcium | D ($Ca^{2+}$) | ~3.6% |
| Sodium | E ($Na^{+}$) | ~2.8% |
Arranging these elements in decreasing order based on abundance:
- Silicon ($Si^{4+}$) - Represented by C
- Aluminum ($Al^{3+}$) - Represented by A
- Iron ($Fe^{2+}$) - Represented by B
- Calcium ($Ca^{2+}$) - Represented by D
- Sodium ($Na^{+}$) - Represented by E
This sequence corresponds to the order C, A, B, D, E.
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