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a
HCl+F2⟶HF+Cl2
b
HF+Cl2⟶F2+HCl
c
Zn+HCl⟶ZnCl2+H2
d
Al+HCl⟶AlCl3+H2
answer is B.
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Detailed Solution
Fluorine is more electronegative than chlorine hence, it can displace Cl from HCI while chlorine cannot displace fluorine from HF. Therefore the following reaction is not validHF+Cl2⟶F2+HCl