Question

aq. chloride turns blue litmus to red why?​

Answer 1

HEY MATE !!!!!!_______________

Acidity is defined by H+ ions, in solution there HCl -> H+ + Cl- therefore giving a positive acidity test. In solid HCl the atoms are bound in a crystalline lattice and are not free. Perhaps if you had molten HCl it would also turn litmus red

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Answer 2

Because aq chloride is acidic in nature as it changes its colour of blue litmus to red.