Assertion : Hg is the only metal that is liquid at 0ºC. Reason : It has a very high I.P. and weak metallic bond.

Mercury is the only metal that is liquid at 0 0 C . This is because the effective nuclear charge is very high, as a result, mercury has a high ionization energy and the bonds between mercury atoms are very weak. Therefore, though mercury is a metal but it is liquid at 0 0 C . 20. Assertion : Cu²⁺ is more stable than Cu⁺. Reason : Electrode potential is more important in determining stable oxidation state than electronic configuration. (a) A (b) B (c) C (d) D The electronic configuration of Cu²⁺ and Cu⁺ is given belo