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JEE MainChemistryp Block Elements (Group 13 & 14)

Among the elements of Group 13 and Group 14, identify the pair of elements that possess the lowest melting points in their respective groups.

Options

  1. ATl and Pb
  2. BGa and Sn
  3. CGa and Pb
  4. DIn and Sn

Correct answer

B. Ga and Sn

Step-by-step solution

In Group 13, the melting point decreases from Boron to Gallium and then increases. The order of melting points is B > Al > Tl > In > Ga . Thus, Gallium ( Ga ) has the lowest melting point in Group 13. In Group 14, the melting point generally decreases down the group but Lead has a slightly higher melting point than Tin. The order is C > Si > Ge > Pb > Sn . Thus, Tin ( Sn ) has the lowest melting point in Group 14. Therefore, the correct pair of elements with the lowest melting points is Ga and Sn . Answer: Ga and S

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