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Q.
$SnCl_4$ is a covalent liquid because:
Chemical Bonding and Molecular Structure
Solution:
Because of high charge density on $Sn^{4+}$ it has high polarising power and thus leads to greater polarisation of anion, i.e., greater distortion of electron clouds of the $Cl^-$ ions. So $SnCl_4$ is most covalent.