Question

Which of the following is a possible formula unit?

Answers

CaK2

AlF3

Br2O

K2Cl

Answer 1

AlF3
Al3+ + F- --> AlF3---> ans

CaK2 is not possible, both Ca2+ and K+ are cations, both elements tend to release electron.

Br2O is not possible either, both Br- and O2- are anions, both elements tend to receive electron.

K2Cl obviously is not possible, Cl has -1 charge, and K has 1+. Both elements will make KCl not K2Cl

Hope this will help you.

Answer 2

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