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Question

The following reaction is known to occur in the body $$CO_{2} + H_{2}O \rightleftharpoons H_{2}CO_{3}\rightleftharpoons H^{+} + HCO_{3}^{-}$$. If $$CO_{2}$$ escapes from the system :


A
pH will decrease
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B
hydrogen ion concentration will decrease
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C
H2CO3 concentration will be unaltered
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D
the forward reaction will be promoted
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Solution

The correct option is B hydrogen ion concentration will decrease
If $$CO_2$$ escapes from the given system, then according to Le Chatelier's principle, the backward reaction will start and due to this backward reaction the concentration of $$H^+$$ ions will be decreased leading to increase in pH.

Chemistry

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