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Solution


Q.

Which of the following order is not correct
1 AlCl3>MgCl2>NaCl [covalent character]  
2 B>Al>Tl>In>Ga [melting point]  
3 AlCl3>MgCl2>NaCl [melting point]  
4 C>Ge>Si>Pb>Sn [3rd ionization enthalpy]  

Ans.

(3)

AlCl3<MgCl2<NaCl  [melting point]

IE3: C>Ge>Si>Pb>Sn,  B>Al>Tl>In>Ga