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NEETChemistryp Block Elements (Group 13 & 14)

Statement I: Boron does not exhibit allotropy Statement II: Boron is extremely hard and black coloured solid

Options

  1. ABoth I & II are correct
  2. BBoth I & II are not correct
  3. CI is correct but II is not correct
  4. DI is not correct but II is correct

Correct answer

D. I is not correct but II is correct

Step-by-step solution

Boron exists in crystalline and amorphous allotropes like - and -rhombohedral and -tetragonal allotrope. Thus, I is not correct. Boron is extremely hard and black-coloured solid and high-melting due to high crystal lattice enthalpy. Thus, II is correct.

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