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InOrganic Chemistry -- Boron
11.
Boron nitride is a
- A.white solid with a diamond-like structure
- B.slippery white solid with a layered structure similar to that of graphite
- C.covalent liquid and is structurally similar to carbon monoxide
- D.soft low-melting solid with a rock-salt–like structure
- Answer
- Report
Answer : [B]
12.
The colour of the borax bead is due to the formation of a/an
- A.glass-like metal metaborote bead
- B.hard boric oxide crystal
- C.opaque metal hexaborate bead
- D.glass-like metal orthoborate bead
- Answer
- Report
Answer : [A]
13.
Which of the following pairs contains structurally dissimilar substances?
- A.Borazine and benzene
- B.Diborane and hydrazine
- C.NaCl and NiO
- D.Graphite and cadmium iodide
- Answer
- Report
Answer : [B]
14.
Which of the following statements is incorrect in the context of the B—F bond in BF3?
- A.All the three B—F bond lengths are equal and each of them is shorter than the sum of the covalent radii of boron and fluorine
- B.The bond energy of the B—F bond is very high, higher than for any other single bond
- C.The unusual shortness and strength of the B—F bond may be explained by a pΠ-pΠ interaction between boron and fluorine atoms.
- D.The unusual shortness and strength of the bonds may be explained by a pΠ-dΠ interaction between the atoms of boron and fluorine.
- Answer
- Report
Answer : [D]
15.
Among the boron halides, which is the strongest Lewis acid?
- A.BBr3
- B.BCl3
- C.BI3
- D.BF3
- Answer
- Report
Answer : [A]
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