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JEE Main202226 Jul 2022Evening ShiftChemistryClassification of Elements and Periodicity in PropertiesActual

The metal that has very low melting point and its periodic position is closer to a metalloid is

Options

  1. AAl
  2. BGa
  3. CSe
  4. DIn

Correct answer

B. Ga

Step-by-step solution

The expected order of melting points of group 13 elements is B > Al > Ga > In > Tl . But due to structural changes, melting point instead of decreasing, increases from Ga to Tl and Ga has the lowest melting point. Hence, the actual order is B > Al > Tl > In > Ga Melting point Al → 933   K Ga → 303   K In → 430   K Se → 490   K Ga has low meting point and it is closer to metalloid in periodic table.

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