S1: Halides of Lithium are generally covalent.
S2: Lithium has high polarisability.
is correct but 
is incorrect. 
is incorrect but 
is correct.
Text Solution
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Lithium halides are somewhat covalent. It is because of the high polarisation capability of lithium ion (The distortion of electron cloud of the anion by the cation is called polarisation). The 
ion is very small in size and has high tendency to distort electron cloud around the negative halide ion. Since anion with large size can be easily distorted, among halides, lithium iodide is the most covalent in nature. Polarisability is defined for anion
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