Reactions are of 4 types: combination, decomposition, displacement& double displacement. Then this reaction :" NaHCO³ + HCl turns into NaCl + CO² + H²O " comes under which category?

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Solution

HCl is a stronger acid, so NaHCO3 acts as a base.
What happens is an acid-base reaction:

HCl + NaHCO3 -> NaCl + H2CO3

But H2CO3 is highly unstable, so it splits into H2O and CO2. Basically, you would see bubbles. During an acid-base reaction a salt is formed,It leads to Double Displacement reaction.

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