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
Dry ice is-
1. Solid NH3
2. Solid SO2
3. Solid CO2
4. Solid N2
Cement, the important building material is a mixture of oxides of several elements. Besides calcium, iron, and sulphur oxides of elements of which of the group(s) are present in the mixture?
1. Group 2
2. Groups 2, 13, and 14
3. Groups 2, and 13
4. Groups 2, and 14
The reason for the small radius of Ga compared to Al is-.
a. Poor screening effect of d and f orbitals
b. Increase in nuclear charge
c. Presence of higher orbitals
d. Higher atomic number
Choose the correct option
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)