An element X burns in oxygen to form an electrovalent compound XO. What is the formula of compounds formed if this element is allowed to combine with sulphur separately ?

Explanation

To determine the formula of the compound formed when element X combines with sulfur, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Charge of Element X:**
- The compound formed with oxygen is XO. Since oxygen typically has a charge of -2 (O^2-), the charge on element X must be +2 (X^2+) to balance the charges in the compound XO.

2. **Determine the Charge of Sulfur:**
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