1.

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:

Answer»

calcium
carbon
silicon
iron

Solution :Pure calcium oxide or lime, is an amorphous white solid, having a HIGH melting point (2273 k)
When lime is added to water, a hissing SOUND is produced and a large amount of heat is GENERATED.
`CaO+H_2O to Ca(OH)_2_(Slaked lime)+Heat`
Therefore, the CORRECT answer is (a)


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