Question

When vinegar is added to baking soda (NaHCO₃) a gas is evolved. The gas evolved, 

P turns lime water milky

Q extinguishes the burning splinter 

R acts as a non-metallic oxide

S has a pungent odour

Which of the following is correct?

Options

• P and S

• P and Q

• P, Q and R

• R and S

Answer 1

P, Q and R

Explanation:

Vinegar reacts with baking soda to produce carbon dioxide (CO₂).

\[\ce{CH3COOH + NaHCO3−> CH3COONa + H2O + CO2}\]

CO₂ turns lime water milky, extinguishes a burning splinter, and is a non-metallic oxide. It is odourless, not pungent.