Q.

When air is bubbled through pure water, the pH value of water drops from 7.0 to 5.6. Which gas is responsible for this change? 

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a

CO

b

Oxygen 

c

Argon

d

Nitrogen

answer is B.

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Detailed Solution

When air is bubbled through pure water, the pH value of water drops from 7.0 to 5.6. Carbon dioxide gas is responsible for this change because CO2 gas is acidic in nature. 

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