JEE MainChemistryp Block Elements (Group 13 & 14)
Given below are four statements regarding the physical properties of Group 13 elements. Identify the incorrect statement.
Options
- ABoron is a non-metal and is extremely hard due to its strong crystalline lattice.
- BGallium has an unusually low melting point and can exist as a liquid during summer.
- CAll elements of Group 13 except Boron are soft metals.
- DThe melting point of Group 13 elements decreases regularly from Boron to Thallium.
Correct answer
D. The melting point of Group 13 elements decreases regularly from Boron to Thallium.
Step-by-step solution
The physical properties of Group 13 elements show significant variations. Boron is a non-metal, extremely hard, and has a very strong crystalline lattice, which gives it an unusually high melting point. Thus, the first statement is correct. The other elements of Group 13 (Al, Ga, In, Tl) are soft metals with relatively lower melting points. Thus, the third statement is correct. Gallium has an unusually low melting point ( 303 K) and can exist in the liquid state during summer. Thus, the second statement is correct.