HCL does not turn blue litmus red but aqueous solution of HCL is able to do so . why

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Solution

Dear Kashish Sengar,

Acidity of acid is due to the concentration of H+ ion. In concentrated sample or gaseous sample H+ ion does not released out but in dilute solution of in presence of water H+ ion can be easily removed from acid.

Hence aq. solution of HCl turn blue litmus red but only HCl can not turn blue litmus red.

Regards

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$H C l$ gas turns blue litmus paper red - True or False?

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Explain why :

(a) anhydrous HCl is a poor conductor while aqueous HCl is an excellent conductor.
(b) when the stopper of a bottle full of hydrogen chloride gas is opened there are fumes in the air.
(c) a solution of hydrogen chloride in water turns blue litmus red and conducts electricity, while a solution of the same gas in toluene :
(i) has no effect on litmus, and
(ii) does not conduct electricity.
(d) thick white fumes are formed when a glass rod dipped in $N H_{4} O H$ is brought near the mouth of a bottle full of HCl gas.
(e) dry hydrogen chloride gas does not affect a dry strip of blue litmus paper but it turns red in the presence of a drop of water.

(f) hydrogen chloride gas is not collected over water.

Q. Why pure acetic acid does not turn blue litmus to red?

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