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InOrganic Chemistry -- Boron
1.
Which of the following compounds is an important catalyst as well as a Lewis acid?
- A.Al2S3
- B.S4N4
- C.N2H4
- D.BF3
- Answer
- Report
Answer : [D]
2.
Amorphous boron is prepared by heating B2O3 with
- A.Mn
- B.Hg
- C.Mg
- D.SiO2
- Answer
- Report
Answer : [C]
3.
Which of the following ions does not exist in an aqueous solution?
- A.Pb2+
- B.sn4+
- C.B3+
- D.Tl+
- Answer
- Report
Answer : [C]
4.
Among the following, which shows the correct order of magnitude of inert-pair effect?
- A.B < Al < Ga < In < Tl
- B.Ga > In > Tl < B > Al
- C.Ga < In < Tl < B < Al
- D.Be ≈ Al > Ga > Tl > In
- Answer
- Report
Answer : [A]
5.
Boron has an extremely high melting point because of
- A.the strong van der Waals forces between its atoms
- B.the strong binding forces in the covalent polymer
- C.its ionic crystal structure
- D.allotropy
- Answer
- Report
Answer : [B]
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