The element which exists in a liquid state for a wide range of temperatures
and can be used for measuring high temperature is:

1. B

2. Al

3. Ga

4. In

Subtopic:  Boron Family- Preparations, Properties & Uses |
 82%
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Which of the following is a Lewis acid?

1. AlCl3

2. MgCl2

3. CaCl2

4. BaCl2

Subtopic:  Boron Family- Preparations, Properties & Uses |
 92%
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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 |
 87%
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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 |
 84%
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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 |
 88%
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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 |
 82%
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The correct increasing order of tendency for catenation among group 14 elements?

1.  C>Si>Ge>Sn

2.  C>>Si>GeSn

3.  Si>C>Sn>Ge

4.  Ge>Sn>Si>C

Subtopic:  Carbon Family - Preparations, Properties & Uses |
 86%
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Silicon has a strong tendency to form polymers like silicones. The chain length of silicone polymer can be controlled by adding

1.  MeSiCl3

2.  Me2SiCl2

3.  Me3SiCl

4.  Me4Si

Subtopic:  Properties of Structure of SiO2 & Other Compounds |
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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 |
 76%
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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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