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Solution


Q.

The group 14 elements A and B have the first ionisation enthalpy values of 708 and 715 kJ mol-1 respectively. The above values are lowest among their group members. The nature of their ions A2+ and B4+ respectively is             [2025]
1 both reducing  
2 both oxidising  
3 oxidising and reducing  
4 reducing and oxidising  

Ans.

(4)