An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is likely to be:
An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is likely to be:
(a) calcium
(b)carbon
(c)silicon
(d)iron
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Pure calcium oxide or lime, is an amorphous white solid, having a high melting point (2273K). When lime is added to water, a hissing sound is produced and a large amount of heat is generated.
Cao + H2O------> Ca(OH)2 + Heat
Therefore, the correct answer is (a).
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