Chemical Bonding and Molecular Structure · Chemistry · KCET

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MCQ (Single Correct Answer)

1

$$ \text { Match List-I with List-II and select the correct option: } $$

List-I (Molecule / ion) List-II (Bond order)
1 . NO 1 . NO 1.NO i. 15
2 . CO 2 . CO 2.CO ii. 2.0
3 . O 2 3 . O 2 3.O_(2)^(-) iii. 2.5
4 . O 2 4 . O 2 4.O_(2) iv. 3.0
KCET 2025
2

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 ?

KCET 2025
3
The change in hybridization (if any) of the 'Al' atom in the following reaction is $\mathrm{AlCl}_3+\mathrm{Cl}^{-} \rightarrow \mathrm{AlCl}_4^{-}$
KCET 2025
4

A pair of isoelectronic species having bond order of one is

KCET 2024
5

Which of the following statement is incorrect?

KCET 2023
6

Dimerisation of solute molecules in low dielectric constant solvent is due to

KCET 2023
7

In oxygen and carbon molecule the bonding is

KCET 2022
8

Which of the following is an incorrect statement?

KCET 2021
9

The correct order of boiling point in the following compounds is

KCET 2021
10

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

KCET 2021
11

Bond angle is $$\mathrm{PH}_4^{+}$$ is more than that of $$\mathrm{PH}_3$$. This is because

KCET 2020
12

Incorrectly matched pair is

KCET 2020
13

Which of the following has the lowest boiling point?

KCET 2020
14

The percentage of $$s$$-character in the hybrid orbitals of nitrogen in $$\mathrm{NO}_2^{+}, \mathrm{NO}_3^{-}$$ respectively are

KCET 2020
15

The formal charge on central oxygen atom in ozone is

KCET 2020
16

Which of the following possess net dipole moment?

KCET 2019
17

Which of the following pair contains 2 lone pair of electrons on the central atom?

KCET 2019
18
The intramolecular hydrogen bond is present in
KCET 2018
19
The state of hybrid orbitals of carbon in $\mathrm{CO}_2$, $\mathrm{CH}_4$ and $\mathrm{CO}_3^{2-}$ respectively is
KCET 2018
20
Acidity of $\mathrm{BF}_3$ can be explained on which of the following concepts?
KCET 2018
21
Which of the following structure of a molecule is expected to have three bond pairs and one lone pair of electrons?
KCET 2017
22
Which of the following elements forms $p_\pi-p_\pi$ bond with itself?
KCET 2017
23

Which of the following is correct electron dot structure of $\mathrm{N}_2 \mathrm{O}$ molecule?

KCET 2017
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