When calcium burns in the presence of oxygen, it forms ‘X’, which when mixed with water forms ‘Y’.
Based on this, choose the correct statement.

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Solution

Metal burns in the presence of oxygen to form metal oxide. So, calcium reacts with oxygen to form calcium oxide (CaO).
When CaO is added to water, calcium hydroxide is formed.
So, Y is calcium hydroxide, and it is basic in nature.

A base turns red litmus blue. So, Y (which is calcium hydroxide) should turn red litmus blue.

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Question 42
An element is placed in 2nd Group and 3rd Period of the Periodic Table, burns in presence of oxygen to form a basic oxide.

(a) Identify the element.

(b) Write the electronic configuration.

(d) Write a balanced equation when this oxide is dissolved in water.

(e) Draw the electron dot structure for the formation of this oxide.

When a fuel burns in the presence of oxygen to form ______.

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