Question:
In group 13 elements, X has lowest melting point and Y has lowest boiling point. X and Y are respectively:
In group 13 elements, X has lowest melting point and Y has lowest boiling point. X and Y are respectively:
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Gallium is famous for melting near room temperature (\(29.8^\circ C\)). It can melt in the palm of the hand.
Updated On: Jun 12, 2026
- B, Tl
- Ga, Tl
- Tl, Tl
- In, Ga
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The Correct Option is B
Solution and Explanation
Concept:
Group 13 elements are:
\[
B,\;Al,\;Ga,\;In,\;Tl
\]
Their melting and boiling points show irregular trends due to poor shielding by \(d\)- and \(f\)-electrons.
Step 1: Identify the element with lowest melting point. Gallium melts at approximately \[ 29.8^\circ C \] which is much lower than the melting points of the other group 13 elements. Therefore, \[ X=Ga \]
Step 2: Identify the element with lowest boiling point. Among group 13 elements, thallium possesses the lowest boiling point. Therefore, \[ Y=Tl \] Hence, \[ \boxed{Ga,\;Tl} \]
Step 1: Identify the element with lowest melting point. Gallium melts at approximately \[ 29.8^\circ C \] which is much lower than the melting points of the other group 13 elements. Therefore, \[ X=Ga \]
Step 2: Identify the element with lowest boiling point. Among group 13 elements, thallium possesses the lowest boiling point. Therefore, \[ Y=Tl \] Hence, \[ \boxed{Ga,\;Tl} \]
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