An element X that react with oxygen and form an oxide $X_{2} O$ . This oxide dissolves in water and turns red litmus blue. Element $X$ is :

M g

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C u

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N a

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S i

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Solution

The correct option is B $N a$
Since the oxide turns red litmus blue, therefore X is a metal because it is an alkaline oxide.
Most of the metals form respective metal oxides when react with oxygen.
Metal + Oxygen $\to$ metal oxide
Examples: (1) Reaction of potassium with oxygen:- Potassium metal forms potassium oxide when reacts with oxygen.
$4 K + O_{2} \to 2 K_{2} O$
(2) Reaction of sodium with oxygen:- Sodium metal forms sodium oxide when reacts with oxygen.
$4 N a + O_{2} \to 2 N a_{2} O$
Most metal oxides are insoluble in water but some of these dissolve in water to form alkalis. Sodium oxide and potassium oxide dissolve in water to produce alkalis.
$N a_{2} O (s) + H_{2} O (l) \to 2 N a O H (a q)$

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