Question

12..Why are soda water and soft drink bottles sealed under high pressure?

Answer 1

Because in aerated drinks co2 is present hence it exert pressure


...........hope it may help u

Answer 2

Answer: Soda water and soft drink bottles sealed under high pressure as solubility of gases increase with increase in pressure. They contain $CO_2$ dissolved in them to form carbonic acid$(H_2CO_3)$.

$CO_2+H_2O\rightarrow H_2CO_3$

According to Henry's law, The mass of a gas dissolved in a unit volume of the liquid at constant temperature is directly proportionl to the pressure of the gas present in equilibrium with the liquid.

$m\propto p$

$m=kp$

m=  mass of the gas dissolved in a unit volume of the liquid

p =  pressure of the gas present in equilibrium with the liquid.

k= constant of proportionality