Question

Colourless compound X obtained from sea water used in daily meals is taken in a test tube. Concentrated $H_{2}S{O}_4$ was added to the test tube. A pungent smelling gas Y comes out which does not affect dry blue litmus paper but turns moist blue litmus paper red. Identify X and Y. Write the chemical reactions involved.

Answer 1

The colourless compound X is NaCl which is obtained from sea water and we use it in our daily meal. NaCl on reaction with $H_{2}S{O}_4$ releases HCl gas which turns moist blue litmus paper red because HCl is acidic in nature reaction can be given as follows:
$NaCl\left(s\right)+H_{2}S{O}_4\left(l\right)\to HCl\left(g\right)+NaHS{O}_4\left(s\right)$