Question

According to the activity chart of metals, which metal would react most vigorously in a dilute acid solution?
A.Zinc
B.Iron
C.Aluminium
D.Magnesium

Answer 1

Hint: We must have to know that in the activity chart of metals, the metals are arranged according to the reactivity of metals from the highest position to the lowest position. And this chart is helpful for determining products in the case of displacement reaction. According to this activity chart, during the displacement reaction, the highest position metal replaces the lowest metal.

Complete answer:
According to the reactivity series, the zinc will react with dilute acid solution and there is a formation of hydrogen gas. The metals are arranged in the reactivity series in the order of decreasing activity of metals. And the zinc is located at the bottom of aluminium and magnesium. Hence, option (A) is incorrect.
According to the reactivity series, the iron is located at the bottom of zinc, aluminum and potassium. Therefore it will not react vigorously with hydrogen. Hence, the option (B) is incorrect.
The aluminum occurs at the fifth position of the reactivity series. And it will lose the electron very easily. But the position of aluminum is just below magnesium. Therefore, it is less reactive than magnesium. Hence, option (C) is incorrect.
Let’s see order reactivity series is,
$$K>Na>Ca>Mg>Al>Zn>Fe>Pb>H>Cu>Hg>Ag>Au$$
Here, the most reactive metal is potassium. The magnesium is located at the fourth position of the reactivity series and it is more reactive than the other three metals which are given in the options. Therefore, the magnesium will displace all the metals which are present in the below position of magnesium metal. Therefore, magnesium would react most vigorously in a dilute acid solution. Hence, the option (D) is incorrect.

Note:
We need to remember that in the reactivity series, the metals are placed in the order of its reactivity. More reactive metal is located at the above position and least reactive metal is located at below position. The noble gases are the least reactive element which is present in the reactive series. The most reactive metal which is present in the reactivity series is potassium and it can displace all the metals below it.