The illustrations below show cations as green spheres and anions as pink spheres. Identify the correct illustration that represents each of the following ionic compounds:
(i) BaCrO₄
(ii) Mg₃(AsO₄)₂ 
(iii) K₂SO₄
(iv) CuBr₂

• A. (i) BaCrO₄: A; (ii) Mg₃(AsO₄)₂: B; (iii) K₂SO₄: C; (iv) CuBr₂: D
• B. (i) BaCrO₄: C; (ii) Mg₃(AsO₄)₂: A; (iii) K₂SO₄: D; (iv) CuBr₂: B
• C. (i) BaCrO₄: D; (ii) Mg₃(AsO₄)₂: C; (iii) K₂SO₄: B; (iv) CuBr₂: A
• D. (i) BaCrO₄: C; (ii) Mg₃(AsO₄)₂: B; (iii) K₂SO₄: D; (iv) CuBr₂: A

Answer: (C)