When substances readily combine with water to form hydrates, the heat of solution in water is usually positive; when, on the other hand, they do not readily form hydrates, or when they are already hydrated, the heat of solution is usually negative. [Please select]
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It tends to form gelatinous hydrates with water, and has a composition corresponding to the formula C{6}H{10}O{6}. [Please select]
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These various ores were found by the same excellent authority to yield iron in the following proportions:-- Hydrates of Iron 57. [Please select]
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