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P Block Elements question

2023 · 12 Apr · Shift 1 · Q1
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P Block Elements question

2023 · 12 Apr · Shift 1 · Q1

JEE MainChemistryP Block ElementsMCQ+4 / −1
Given below are two statements : Statement I : Boron is extremely hard indicating its high lattice energy. Statement II : Boron has highest melting and boiling point compared to its other group members. In the light of the above statements, choose the most appropriate answer from the options given below :
  1. A
    Both Statement I and Statement II are incorrect
  2. B
    Statement I is incorrect but Statement II is correct
  3. C
    Statement I is correct but Statement II is incorrect
  4. D
    Both statement I and Statement II are correct
View written solutionFree

Correct answer: D

  1. Analyze Statement I: "Boron is extremely hard indicating its high lattice energy."

    • Boron exists as a covalent network solid with a very rigid three-dimensional structure.
    • Because of this strong bonding throughout the lattice, boron is very hard.
    • In inorganic chemistry/JEE context, this is commonly interpreted as due to very strong interatomic forces / high lattice energy.

    Therefore, Statement I is correct.

  2. Analyze Statement II: "Boron has highest melting and boiling point compared to its other group members."

    • Boron belongs to Group 13: B, Al, Ga, In, Tl\text{B, Al, Ga, In, Tl}B, Al, Ga, In, Tl.
    • Boron has a much higher melting point and boiling point than the other members because of its strong covalent network structure.
    • The heavier members are metallic and generally have lower melting/boiling points compared with boron.

    Therefore, Statement II is also correct.

  3. Choose the correct option:

    Since both statements are correct, the correct option is: D\boxed{\text{D}}D​

  4. Comparison with stored answer:

    • Derived answer: D\boxed{\text{D}}D​
    • Stored correct answer: D\boxed{\text{D}}D​

    They match.

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