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 Icl while chlorine cannot displace fluorine from HF. Therefore the FOLLOWING REACTION is not valid.
`HF + Cl_(2) to F_(2) + HCl`


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