iii) Why some metals like K, Na are not available in free state?
iv) Name one mineral/ore which is hydrous
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☑Metals like sodium, potassium, calcium and magnesium are present high on the activity series so they are highly reactive metals. These metals can displace hydrogen ions from the solution giving hydrogen gas. Reactive metals are never found in free state as they have high affinity for other elements.
☑The hydrous mineral Gypsum has a chemical formula of "CaSO4 · 2H2O".
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