A) Moissan boron is amorphous
B) The reaction between boron and concentrated \[\text{HN}{{\text{O}}_{\text{3}}}\]gives \[{{\text{N}}_{\text{2}}}\text{O}\]
C) Amorphous boron on heating with oxygen forms \[{{\text{B}}_{\text{2}}}{{\text{O}}_{\text{3}}}\]
D) Boron is a non-conductor of electricity
Correct Answer: B
Solution :
Boron reacts with concentrated \[\text{HN}{{\text{O}}_{\text{3}}}\]to give orthoboric acid and nitrogen dioxide. \[\text{B}+\text{3HN}{{\text{O}}_{\text{3}}}\xrightarrow{{}}{{\text{H}}_{\text{3}}}\text{B}{{\text{O}}_{\text{3}}}+\text{3N}{{\text{O}}_{\text{2}}}\]
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