1.

X_2 is a greenish yellow gas with an offensive smell used in water purification. It partially dissolves in water to give a solution which turns blue litmus red. When X_2 is passed through NaBr solution, Br_2 is obtained. Name the group to which it belongs.

Answer»

SOLUTION :`X_2` is chlorine which is a yellowish green gas. It dissolves in water forming HCL and HClO
`Cl_2+ H_2O to HCl + HClO`
HCl turns blue LITMUS to RED .
`Cl_2 + 2NaBr to 2NaCl + Br_2`
It belongs to group 17.


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