The group of elements that have the most similar chemical properties are Mg, Ca, Ba. Thus correct option is 2.
The group of elements that have been present in the same group in the periodic table tends to have similar chemical properties.
1. Mg, Al, Si:
Mg has been alkaline earth metal of group 2, while Al has been metal and Si has been a nonmetal.
2. Mg, Ca, Ba
Mg has been alkaline earth metal of group 2, Ca and Ba have been alkaline earth metal of group 2. Thus they exhibit similar properties.
3, K, Al, Ni
K has been Alkali metal of group 1 while Al has been metal and Ni has been a transition metal.
4. K, Ca, Ga
K has been Alkali metal of group 1 while Ca has been alkaline earth metal of group 2, and Ga has been metal.
Thus the group of elements that have the most similar chemical properties are Mg, Ca, Ba. Thus correct option is 2.
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