What do you observes when:
Moist blue litmus paper is introduced in the jar of Hydrogen chloride gas?

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Solution

The following reactions will take place when Moist blue litmus paper is introduced in the jar of Chlorine

$C l_{2} + H_{2} O \to H O C l + H C l$ .

$H C l + H_{2} O \to H_{3} O^{+} + C l^{-}$

Since $H 3 O^{+}$ has been produced, the moist blue litmus paper will turn into red.

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