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 ?
1. B
2. Al
3. Ga
4. In
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
The correct increasing order of tendency for catenation among group 14 elements?
1.
2.
3.
4.
Silicon has a strong tendency to form polymers like silicones. The chain length of silicone polymer can be controlled by adding
1. | 2. | ||
3. | 4. |
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
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. |
Identify the correct resonance structures of carbon dioxide from one given below
a.
b.
c.
d.
Choose the correct option:
1. | (a, b) | 2. | (b, c) |
3. | (c, d) | 4. | (b, d) |
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
Quartz is extensively used as a piezoelectric material, it contains-
1. | Pb | 2. | Si |
3. | Ti | 4. | Sn |
The most commonly used reducing agent among the following is :
1. AlCl3
2. PbCl2
3. SnCl4
4. SnCl2