Respuesta :
The study of chemicals is called chemistry.
The correct answer is A.
A combination reaction is defined as the joining of two different elements to form a new compound is called a combination reaction. A new compound is always formed in the reaction.
According to the question, in option A the [tex]Li_2Co_3[/tex] is formed and in reaction 4 [tex]H_2So_4[/tex] is formed.
Hence, the correct option is A that is Z1 and Z4.
For more information, refer to the link:-
https://brainly.com/question/12985618