Question

Which is NOT the correct statement about boron and silicon?

• A. They exhibit allotropy.
• B. They exist in both crystalline and amorphous state.
• C. They form solid chlorides.
• D. They form volatile hydrides.

Answer 1

Answer: (C)

They form solid chlorides.

Both boron and silicon exist in amorphous and crystalline state and exhibit allotropy.
They form numerous volatile hydrides which spontaneously catch fire on exposure to air and are easily hydrolysed.
The chlorides of both are liquid, fume in most air and readily hydrolysed by water.