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Solution


Q.

Given below are two statements:                                 [2025]

Statement (I): The first ionisation enthalpy of group 14 elements is higher than the corresponding elements of group 13.

Statement (II): Melting points and boiling points of group 13 elements are in general much higher than those of corresponding elements of group 14.

In the light of the above statements, choose the most appropriate answer from the options given below:
1 Statement I is correct but Statement II is incorrect  
2 Statement I is incorrect but Statement II is correct  
3 Both Statement I and Statement II are incorrect  
4 Both Statement I and Statement II are correct  

Ans.

(1)

Statement I: Ionization energy increases from left to right in a periodic table, hence group 14 elements have higher ionization energy than group 13 elements in respective periods.

Statement II: Group 14 elements have higher boiling points than group 13 elements of respective periods.

  B Al Ga In Tl
First ionization enthalpy (kJ/mol) 801 577 579 558 589
Melting point (K) 2453 933 303 430 576
Boiling point (K) 3923 2740 2676 2353 1730

 

  C Si Ge Sn Pb
First ionization enthalpy (kJ/mol) 1086 786 761 708 715
Melting point (K)
4373
1693 1218 505 600
Boiling point (K)   3550 3123 2896 2024