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 |
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)
The linear shape of CO2 is due to _______.
a. sp3 hybridisation of carbon
b. sp hybridisation of carbon
c. bonding between carbon and oxygen
d. sp2 hybridisation of carbon
Choose the correct option
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)
Me3SiCl is used during polymerization of organ silicones because
a. | Chain length of organic silicone polymers can be controlled by adding |
b. | blocks the end terminal of silicone polymer. |
c. | improves the quality and yield of the polymer. |
d. | acts as a catalyst during polymerization. |
Choose the correct option:
1. | (a, b) | 2. | (b, c) |
3. | (c, d) | 4. | (a, d) |