Chemical Bonding and Molecular Structure · Chemistry · KCET
MCQ (Single Correct Answer)
(a) All $\text{C}-\text{O}$ bonds in $\text{CO}_3^{2-}$ are equivalent
(b) There are three resonance structures possible for $\text{CO}_3^{2-}$ ion
(c) The position of carbon and oxygen should change in every resonance structure
(d) The formal charge on carbon atom is $-2$
(a) $\text{BF}_3 > \text{NF}_3 > \text{NH}_3$ (Dipole moment)
(b) $\text{HgCl}_2 > \text{NH}_4^+ > \text{SF}_6$ (Bond angle)
(c) $\text{NH}_3 < \text{H}_2\text{O} < \text{HF}$ (Strength of intermolecular hydrogen bonding)
(d) $\text{H}-\text{I} > \text{H}-\text{Br} > \text{H}-\text{Cl}$ (Bond length)
$$ \text { Match List-I with List-II and select the correct option: } $$
| List-I (Molecule / ion) | List-II (Bond order) |
| i. 15 | |
| ii. 2.0 | |
| iii. 2.5 | |
| iv. 3.0 |
The electronic configuration of X and Y are given below:
$$ \begin{aligned} & X: 1 s^2 2 s^2 2 p^6 3 s^2 3 p^3 \\ & Y: 1 s^2 2 s^2 2 p^6 3 s^2 3 p^5 \end{aligned} $$
Which of the following is the correct molecular formula and type of bond formed between X and Y ?
A pair of isoelectronic species having bond order of one is
Which of the following statement is incorrect?
Dimerisation of solute molecules in low dielectric constant solvent is due to
In oxygen and carbon molecule the bonding is
Which of the following is an incorrect statement?
The correct order of boiling point in the following compounds is
Bond enthalpies of $$A_2, B_2$$ and $$A B$$ are in the ratio $$2: 1: 2$$. If bond enthalpy of formation of $$A B$$ is $$-100 \mathrm{~kJ} \mathrm{~mol}^{-1}$$. The bond enthalpy of $$B_2$$ is
Bond angle is $$\mathrm{PH}_4^{+}$$ is more than that of $$\mathrm{PH}_3$$. This is because
Incorrectly matched pair is
Which of the following has the lowest boiling point?
The percentage of $$s$$-character in the hybrid orbitals of nitrogen in $$\mathrm{NO}_2^{+}, \mathrm{NO}_3^{-}$$ respectively are
The formal charge on central oxygen atom in ozone is
Which of the following possess net dipole moment?
Which of the following pair contains 2 lone pair of electrons on the central atom?
Which of the following is correct electron dot structure of $\mathrm{N}_2 \mathrm{O}$ molecule?