• # question_answer 76) The most abundant metal in the earth's crust is A)  Al                   B)  FeC)  Na                D)  Ca

The most abundant metal in earth's crust is Al. While oxygen is the most abundant element in the earth's crust > the order of abundant of elements in earth's crust is as follows: $\text{O}>Si>Al>Fe>Ca>Na$ Hence, the correct option is [a].