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 chlorine

Explanation

To solve the problem, we need to determine the formula of the compound formed when element X combines with chlorine, given that it forms an electrovalent compound XO when it burns in oxygen.

### Step-by-Step Solution:

1. **Identify the Charge of Element X**:
- The compound XO indicates that element X combines with oxygen (O) to form an electrovalent (ionic) compound.
- Oxygen typically has a charge of -2 (O²⁻) in ionic compounds.
- To balance the charges in the compound XO, element X must have a charge of +2 (X²⁺).
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