What is the reason of forming gas bubbles when a coke bottle is opened?

Increase in pressure

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Decrease in pressure

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Coke reacts with gases in air

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None of the above

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Solution

The correct option is B Decrease in pressure
Henry’s law states that by increasing pressure on liquids, solubility of gases increases. To make the drinks fizzy, manufactureres add $C O_{2}$ gas which is done under high pressure of $C O_{2}$ . When we open the bottle the pressure decreases to normal atmospheric pressure which decreases the solubility of $C O_{2}$ gas. So the gas evolves from the drink forming bubbles.

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oojho took an empty plastic bottle, turned it upside down and dipped its open mouth into a bucket filled with water. He then tilted the bottle slightly and made the following observations.

(i) Bubbles of air came out from the bottle.

(ii) Some water entered the bottle.

(iii) Nitrogen gas came out in the form of bubbles and oxygen gets dissolved in water.

(iv) No bubbles formed, only water entered the bottle

Which observations is/are correct?

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