Question

Answer 1

\(R_x^{III}\left(CO_3\right)_y^{II}\)

Theo quy tắc hóa trị

=> III.x = II.y

=> \(\dfrac{x}{y}=\dfrac{II}{III}=\dfrac{2}{3}\)

=> CTHH: X₂(CO₃)₃

=> A

Answer 2

A nha!

Answer 3

\(X_x^{III}(CO_3)_y^{II}\\ \Rightarrow x.III=y.II\Rightarrow \dfrac{x}{y}=\dfrac{2}{3}\\ \Rightarrow x=2;y=3\\ \Rightarrow X_2(CO_3)_3\\ \Rightarrow A\)

Answer 4

Chọn A