1.

The melting pt. of 13 group follows the order

Answer»

`BgtAlgtGagtIngtTl`
`BgtAlgtGagtIngtTl`
`BgtAlgtTlgtIngtGa`
`BgtAlltGaltInltTl`

SOLUTION :Due to structural changes. MELTING POINT, INCREASE from Ga to Tl and Ga has the lowest melting point.


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