JEE Main 202427 JanuaryMorning Shift
- Exam
- JEE Main
- Year
- 2024
- Date
- 27 January
- Shift
- Morning Shift
- Subject
- Chemistry
- Chapter
- p Block Elements (Group 13 & 14)
JEE Main 2024 · 27 January · Morning Shift · Chemistry · p Block Elements (Group 13 & 14)
Given below are two statements : one is labelled as Assertion ( A )...
Given below are two statements : one is labelled as Assertion and the other is labelled as Reason .
Assertion (A) : Melting point of Boron is unusually high in group elements.
Reason (R) : Solid Boron has very strong crystalline lattice.
In the light of the above statements, choose the most appropriate answer from the options given below ;
Assertion (A) : Melting point of Boron is unusually high in group elements.
Reason (R) : Solid Boron has very strong crystalline lattice.
In the light of the above statements, choose the most appropriate answer from the options given below ;
Options
- ABoth (A) and (R) are correct but (R) Is not the correct explanation of (A)
- BBoth (A) and (R) are correct and (R) is the correct explanation of (A)
- C(A) is true but (R) is false
- D(A) is false but (R) is true
Correct answer
B. Both (A) and (R) are correct and (R) is the correct explanation of (A)
Step-by-step solution
Boron is non-metallic in nature. It is extremely hard and black coloured solid. Due to a very strong crystalline lattice, boron has an unusually high melting point. The rest of the members are soft metals with a low melting point and high electrical conductivity.
Hence, Solid Boron has very strong crystalline lattice, so its melting point is unusually high in group elements.
Both (A) and (R) are correct and (R) is the correct explanation of (A)