Question

select the correct answer. the ions cr³⁺ and o²⁻ combine to form the ionic compound chromium oxide. in what proportions do these ions combine to produce a neutral compound? a. 3:2 b. 3:3 c. 1:1 d. 2:3 e. 1:3

Explanation:

Step1: Determine charges of ions

$Cr^{3 + }$ has a charge of + 3 and $O^{2 - }$ has a charge of - 2.

Step2: Find ratio for neutral compound

To form a neutral compound, the total positive charge must equal the total negative charge. Let the number of $Cr^{3+}$ ions be $x$ and the number of $O^{2 - }$ ions be $y$. Then $3x=2y$. The ratio $x:y = 2:3$.

Answer:

D. 2:3