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Selenium is considered a heavy metal (although ironically a non-metal) and when combined with oxygen has relatively weak intramolecular forces that are easily overcome by the strong polarity of water forcing it to ionise. Sulfur ionises less readily

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14y ago
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8y ago

Selenium dioxide is considered acidic. It reacts with water to form selenous acid, which gives selenate salts with bases.

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11y ago

no

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Q: Is selenium-dioxide is more acidic then sulfur-dioxide?
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