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CBSE Class 10 Science Question 3 of 31

Metals and Non-metals — Question 3

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Question

Questions 3

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

  1. Calcium
  2. Carbon
  3. Silicon
  4. Iron
Answer

Calcium

Reason — The resulting compound must be ionic as it has a high melting point which means that it must be formed by the reaction of a metal with oxygen. So, it will be either Calcium or Iron.
As oxide of Calcium is soluble in water but oxides of Iron are not, hence the element is likely to be Calcium.