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Explanation: 1. The magnesium ribbon burns with a white dazzling to form magnesium oxide. Yes, a new substance, magnesium oxide(ash) is formed.
2. No the ash does not looks like magnesium ribbon. It is a chemical change so it can't be reversed back.
3. Yes a new substance, magnesium oxide is formed.
4. Magnesium oxide is basic in nature so it will turn red litmus to blue.
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