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NEETChemistryd and f Block Elements

What is a notable characteristic of the hardness of some borides, which are interstitial compounds?

Options

  1. AThey are very soft
  2. BThey are as hard as graphite
  3. CThey approach diamond in hardness
  4. DThey have no hardness

Correct answer

C. They approach diamond in hardness

Step-by-step solution

Interstitial compounds are very hard, some borides approach diamond in hardness.

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