Covalent Bond

Q. Among $B_2{H}_6,B_3{N}_3{H}_6,N_{2}O,N_2{O}_4,H_2{S}_2{O}_{3}and{H}_2{S}_2{O}_8,$ the total number of molecules containing covalent bond between two atoms of the same kind is:

Q.

How many P Orbitals does Oxygen have?

Q. Ionic bond is not present in which of the following compounds?

1. $NaOH$
2. $HCl$
3. $K_{2}S$
4. $LiH$

Q.

The strength of a bond depends upon

1. free rotation about σ bond

2. extent of overlap between the orbitals

3. resonance in the molecule

4. whether the overlap is axial or sidewise

Q. Which of the following statement(s) is/are correct for diamond?

1. Used as an abrasive for sharpening hard tools.
2. It is used in making dyes.
3. It is used in the manufacture of tungsten filaments for electric light bulbs.
4. All of the above.

Q. Given below are two statements : One is labelled as $AssertionA$ and the other is labelled as $ReasonR$.

$AssertionA$ : Lithium halides are some what covalent in nature.

$ReasonR$ : Lithium possess high polarisation capability.

In the light of the above statements, choose the most appropriate answer from the options given below

JEE MAIN 2021

1. Both $A$ and $R$ are true and $R$ is the correct explanation of $A$
2. Both $A$ and $R$ true but $R$ is NOT the correct explanation of $A$
3. $A$ is false but $R$ is true
4. $A$ is true but $R$ is false

Q. Which of the following observations are incorrect for the noble gases - He, Ne, Ar, Kr, and Xe?

1. The general ground state valence electron configuration is $n{s}^{2}n{p}^6$
2. The given noble gases belong to the far right of the periodic table and exhibit very high electronegativity
3. Compared to the other elements, these elements are monoatomic gases at room temperature
4. They all show negative values of electron affinity
5. Also, these gases have a comparatively high first ionization energy

Q. Among $B_2{H}_6,B_3{N}_3{H}_6,N_{2}O,N_2{O}_4,H_2{S}_2{O}_{3}and{H}_2{S}_2{O}_8,$ the total number of molecules containing covalent bond between two atoms of the same kind is:

Q. Which of the following will contain the highest number of oxygen atoms?

1. 16 g of O atom
2. 32 g of $O_2$ molecule
3. 48 g of $O_3$ molecule
4. None, all have the same number of oxygen atoms

Q. The number of carbon atoms per unit cell of diamond is:
(NEET-UG – 2013)

1. $6$
2. $4$
3. $8$
4. $1$

Q. Arrange the following bonds according to their average bond energies in descending order:
$C-Cl,C-Br,C-F,C-I$

JEE MAIN 2020

1. $C-Cl>C-Br>C-I>C-F$
2. $C-F>C-Cl>C-Br>C-I$
3. $C-Br>C-I>C-Cl>C-F$
4. $C-I>-Br>C-Cl>C-F$

Q. <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> When the first electron gain enthalpy $\left({\Delta }_{eg}H\right)$ of oxygen is $-141kJ/mol,$ its second electron gain enthalpy is:

JEE MAIN - 2019

1. Almost the same as that of the first
2. Negative, but less negative than the first
3. A positive value
4. A more negative value than the first