Question

Second and third most abundant metal in earth’s crust
(A) Aluminium, calcium
(B) Iron, silver
(C) Iron, calcium
(D) None

Answer 1

Hint: There are two perspectives while answering the given question. The knowledge of the relative abundance of the metals in the earth’s crust can help us solve the given illustration easily.

Complete answer:
Let us see about the abundance of the metals in the earth’s crust;
Aluminium-
Al is the most abundant element found on earth’s crust (in about 8%). It is a post-transitional metal. However, it has always been found in the combined states with other elements like alum and aluminium oxide.
Iron-
The second most abundant metal on earth’s crust is iron (in about 5%). It is a transition metal and is obtained from minerals like hematite and magnetite. It is also an important nutrient in the human body.
Calcium-
The third most abundant metal found on earth’s crust is calcium (in about 4%). It is readily found throughout the earth’s surface in the form of rocks and minerals such as limestone.
Therefore, the second most abundant metal is iron and the third most abundant metal is calcium.

Hence, option (C) is correct.

Note:
Do note that as we see by astronomer’s point of view; the three most abundant elements will be Oxygen, Silicon and Aluminium. But when asked to chemist, the first three elements will be as stated above followed by Sodium, Potassium, Magnesium and surprisingly, Titanium.