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Solution


Q.

Match List I with List II.

  List I   List II
A. Melting Point [K] I. Tl>ln>Ga>Al>B
B. Ionic Radius [M+3/pm] II. B>Tl>Al≈Ga>ln
C. ∆iH1[kJ mol-1] III. Tl>In>Al>Ga>B
D. Atomic Radius [pm] IV. B>Al>Tl>In>Ga

 

Choose the correct answer from the options given below:               [2024]
1 A-IV, B-I, C-II, D-III  
2 A-II, B-III, C-IV, D-I  
3 A-III, B-IV, C-I, D-II  
4 A-I, B-II, C-III, D-IV  

Ans.

(1)

A. 

Element B Al Ga In Tl
Melting point (K) 2453 (Unusually high) 933 303 (liquid in summers) 430 576

        Order of melting point is : B>Al>Tl>In>Ga.

B.   Ionic radius increases down the group due to increase in number of shells. Order of ionic radius is: Tl>In>Ga>Al>B.

C.   Ionization energy decreases down the group. But Ga and Tl have ionization energy more than expected value because of poor shielding of d and f electrons respectively. Order of ionization energy is : B>Tl>Ga>Al>In

D.    Atomic radius increases down the group due to increase in number of shells but Ga is smaller than Al due to poor shielding of d electrons.

Element B Al Ga In Tl
Atomic radius (pm) 88 143 135 167 170

Order of atomic radius is: Tl>In>Al>Ga>B.