1.

Which reaction is not valid ?

Answer»

`HCl +F_(2) to HF+Cl_(2)`
`HF+Cl_(2) to F_(2)+HCl`
`ZN+HCl to ZnCl_(2)+H_(2)`
`Al+HCl to AlCl_(3)+H_(2)`

Solution :FLUORINE is more electronegative than chlorine hence, it can DISPLACE Cl from Cl from HCl while chlorine cannot displace fluroine from HF. Therefore the FOLLOWING REACTION is not valid.
`HF+Cl_(2) to F_(2)+HCl`


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