Most of the metals react chemically with other substances in one form or another. Few metals which do not react with common chemicals are called noble metals e.g., silver, gold, platinum. The rate of reaction with which metals react is not same for all the metals. The rate of reaction depends on the reactivity of metals. On the basis of their reactive nature, a series known as reactivity series has been drawn in which metals are arranged in decreasing order of their reactivity.

Pieces of copper, lead, aluminium and zinc are added to dilute hydrochloric acid. Which of the following test tubes most likely contains zinc?

Options

A. (I)
B. (II)
C. (III)
D. (IV)

Answer

D

Explanation

The order of reactivity with dilute hydrochloric acid is Al > Zn > Pb > Cu. Hence, test tube (I) contains lead, test tube (II) contains aluminium, test tube (III) contains copper and test tube (IV) contains zinc.