Answer: The correct answer is Option 2.
Explanation:
The reaction between a metal and HCl is a type of single displacement reaction.
Single replacement reactions are defined as the reactions in which more reactive metal replaces less reactive metal from its chemical equation. The reactivity is determined from the series called reactivity series. The metal lying above in the series is more reactive than the metal lying below in the series.
General equation for these types of reactions is:
[tex]AB+C\rightarrow CB+A[/tex]
From the series attached below, the most reactive metal is Potassium (K).
Increasing order of the reactivity of metals are:
[tex]Zn<Mg<Ca<K[/tex]
Hence, the correct answer is Option 2.
(K) potassium is the metal that will react most readily with 1.0 M HCl to produce H2(g).
Potassium is a silvery-white metal with the symbol K and atomic number 19.
The reaction will be
[tex]\rm K + 2HCl = KCl_2 + H_2(g)[/tex]
The potassium will react with HCl to produce potassium chloride and hydrogen gas.
It is a single displacement reaction.
In this type of reaction, more reactive metal is displaced with less reactive metal.
Thus, the correct option is 2) K.
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