ANSWER IT WITH THE CHEMICAL EQUATION....
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NaCl (s)+H2SO4 (conc.)------->Na2SO4+HCl (g)
If the Hcl gas is first tested with dry litmus(blue) the paper will not turn red as there is not much water get ionise and release H+ ions.
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Answer:
Nacl(aq) +H2SO4(aq) > Na2SO4(aq) +HCl (g)
Explanation:
Nature of gas is acidic......... And it will not show acidic behavior when tested with dry litmus......
In wet litmus colour will change from blue to red
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