The metal borides that contain isolated boron atoms are:
Show Hint
- Tc\(_7\)B\(_3\) and Re\(_7\)B\(_3\)
- Cr\(_5\)B\(_3\) and V\(_3\)B\(_2\)
- Ti\(_4\)B\(_4\) and V\(_3\)B\(_4\)
- TiB and HfB
The Correct Option is A
Solution and Explanation
Step 1: Review the options.
- (A) Tc\(_7\)B\(_3\) and Re\(_7\)B\(_3\) both contain isolated boron atoms.
- (B) Cr\(_5\)B\(_3\) and V\(_3\)B\(_2\) involve clusters of boron atoms, so they do not contain isolated boron atoms.
- (C) Ti\(_4\)B\(_4\) and V\(_3\)B\(_4\) also contain boron clusters.
- (D) TiB and HfB are typical binary borides, but they do not contain isolated boron atoms.
Final Answer: (A) Tc\(_7\)B\(_3\) and Re\(_7\)B\(_3\)
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