Question

A number of elements are available in earth’s crust but most abundant elements are ____________.

• A. $Cu\text{and}Ag$
• B. $Al\text{and}Cu$
• C. $Al\text{and}Fe$
• D. $Fe\text{and}Cu$

Answer 1

The correct option is C $Al\text{and}Fe$

Percentage of Elements that occur naturally in the earth’s crust

• Oxygen $\left(47\%\right)$
• Silicon $\left(28\%\right)$
• Aluminium $\left(8\%\right)$
• Calcium $\left(3.5\%\right)$
• Sodium $\left(3\%\right)$
• Potassium $\left(2.5\%\right)$
• magnesium $\left(2\%\right)$
• Iron $\left(5\%\right)$

Aluminium is the most abundant metal available on earth’s crust by weight $\left(8\%\right)$ and iron is the second most abundant metal available on earth’s crust by weight$\left(5\%\right)$.

So, the correct answer is option (a).