Question

A substance ‘X’ is used to make the cake soft and spongy. On heating this substance ‘X’, it produces a gas ‘Y’, which extinguishes a burning splinter. This gas ‘Y’ on reaction with limewater turns it milky. Identify ‘X’ and ‘Y’ and also write the balanced chemical equations for the reactions involved.

Answer 1

Answer:

x=baking soda

y= carbon dioxide

2 NaHCO3-------Na2CO3+H2O+CO2

Answer 2

Let us look at the answer:

Explanation:

The substance X is baking soda, sodium hydrogen carbonate NaHCO₃ which is used in baking.

NaHCO₃ ----> NaOH + CO₂

On heating, it decomposes and evolve bubbles of carbon dioxide creating pores and making it spongy.

CO₂ reacts with lime water (CaCO₃) and make it milky.

X-- baking soda (NaHCO₃)

Y -- CO₂