Question

An element X reacts with oxygen to give a compound with a high melting point. This
compound is also soluble in water. Identify to the X​

Answer 1

ANSWER:

The element 'X' is most likely to be calcium.

Calcium reacts with water to give calcium hydroxide which has a very high melting point.

reaction : Ca + 2H₂O = Ca(OH)₂ + H₂

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Answer 2

Element X is Calcium

Calcium reacts with oxygen to form Calcium oxide which is soluble in water to form calcium hdroxide.

Explanation:

• An element X reacts with oxygen to give a compound with a high melting point

• Element is Calcium

• Chemical formula of the oxide is Calcium oxide

• The molecule is the combination of Calcium cation and oxygen anion

• Calcium oxide so formed is a white solid in the form of lumps which is odourless and hard in nature.

• Calcium oxide reacts with water and it forms calcium hydroxide.

• Calcium oxide is soluble in water to form calcium hydroxide.

• CaO + H₂O → Ca(OH)₂