A compound X of sodium forms a white powder .It is a consituent of baking powder and used in some antacids .when heated it gives a compound Y which is anhydrous and absorbs water to become hydrated salt .When this salt kept open in air looses water molecules in a process called efflorescence .When dissolved in water it forms a strong base and a weak acid Z.
What is the nature of the solution formed by dissolving Y in water ?

Options

A. Alkaline
B. Acidic
C. neutral
D. It remains insoluble

Answer

A

Explanation

`Na_(2)CO_(3)+2H_(2)Otounderset("Strong base ")(2NaOH)+underset("Weak acid")underset((Z))(H_(2)CO_(3))` NaOH ionises completely to give a large amount of `OH^(-)` ions whereas `H_(2)CO_(3)` ionises partially to give a small amount of `H^(+)` ions .Hence , the solution is overall alkaline .