The geometry of a complex species can be understood from the knowledge of the type of hybridization of orbitals of the central atom. The hybridization of orbitals of a central atom in [B(OH4)]- and the geometry of the complex are respectively

1. sp3, tetrahedral

2. sp3, square planar

3. sp3d2, octahedral

4. dsp2, square planar

Subtopic:  Compounds of Boron- Preparations, Properties & Uses |
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Which of the following oxides is acidic in nature?

1. B2O3

2. Al2O3

3. Ga2O3

4. In2O3

Subtopic:  Compounds of Boron- Preparations, Properties & Uses |
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The exhibition of the highest coordination number depends on the availability of vacant orbitals in the central atom. Which of the following elements is not likely to act as a central atom in MF63-?

1. B

2. Al

3. Ga

4. In

Subtopic:  Compounds of Boron- Preparations, Properties & Uses |
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Boric acid is an acid because its molecule

1. Contains replaceable H+ ion

2. Gives up a proton

3. Accepts OH- from water releasing proton

4. Combines with proton from water molecule

Subtopic:  Compounds of Boron- Preparations, Properties & Uses |
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The correct order of Ionization enthalpy (iH kJ mol-1) for the elements of group 13 among the following is-

1.  B>Al>Ga>In>Tl

2.  B<Al<Ga<In<Tl

3.  B<Al>Ga<In<Tl

4.  B>Al<Ga>In<Tl

Subtopic:  Compounds of Boron- Preparations, Properties & Uses |
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In the structure of diborane,

1. All hydrogen atoms lie in one plane and boron atoms lie in a plane perpendicular to this plane.

2. 2 boron atoms and 4 terminal hydrogen atoms lie in the same plane and 2 bridging hydrogen atoms lie in the perpendicular plane

3. 4 bridging hydrogen atoms and boron atoms lie in one plane and two terminal hydrogen atoms lie in a plane perpendicular to this plane

4. All the atoms are in the same plane

Subtopic:  Compounds of Boron- Preparations, Properties & Uses |
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A compound X, of boron, reacts with NH3 on heating to give another compound Y which is called inorganic benzene. The compound X can be prepared by treating BF3 with lithium aluminum hydride. The compounds X and Y are represented by the formulas.

1.  B2H6, B3N3H6

2.  B2O3, B3N3H6

3.  BF3, B3N3H6

4.  B3N3H6, B2H6

Subtopic:  Compounds of Boron- Preparations, Properties & Uses |
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Which of the following statements are correct?

(Answer on the basis of the given figure.)

a. The two bridged hydrogen atoms and the two boron atoms lie in one plane

b.  Out of six B-H bonds, two bonds can be described in terms of 3-center-2-electron bonds

c.  Out of six B-H bonds, four B-H bonds can be described in terms of 3 center 2 electron bonds

d.  The four-terminal B-H bonds are two center-two electron angular bonds

Choose the correct option

1. (a, b, c)
2. (b, c, d)
3. (a, c, d)
4. (a, b, d)

Subtopic:  Compounds of Boron- Preparations, Properties & Uses |
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