Periodic Table and Periodicity · Chemistry · KCET

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MCQ (Single Correct Answer)

1

$$ \text { Given below and the atomic masses of the elements: } $$

$$ \begin{array}{|l|l|l|l|l|l|l|l|l|l|} \hline \text { Element: } & \mathrm{Li} & \mathrm{Na} & \mathrm{Cl} & \mathrm{~K} & \mathrm{Ca} & \mathrm{Br} & \mathrm{Sr} & \mathrm{I} & \mathrm{Ba} \\ \hline \text { Atomic Mass }\left(\mathrm{g} \mathrm{~mol}^{-1}\right): & 7 & 23 & 35.5 & 39 & 40 & 80 & 88 & 127 & 137 \\ \hline \end{array} $$

$$ \text { Which of the following doesn't form triad? } $$
KCET 2025
2

The correct order of first ionisation enthalpy of given elements is

KCET 2023
3

A pair of amphoteric oxides is

KCET 2023
4

In which one of the following pairs, both the elements does not have $$(n-1) d^{10} n s^2$$ configuration in its elementary state?

KCET 2023
5

Amphoteric oxide among the following

KCET 2022
6

The property of halogens which is not correctly matched is

KCET 2022
7

Which noble gas has least tendency to form compounds?

KCET 2022
8

Elements $$X, Y$$ and $$Z$$ have atomic numbers 19, 37 and 55 respectively. Which of the following statements is true about them ?

KCET 2022
9

The third ionisation enthalpy is highest in

KCET 2021
10

The first ionisation enthalpy of the following elements are in the order :

KCET 2019
11
Which of the following is the correct order of radius?
KCET 2018
12
Which of the following is an amphoteric oxide?
KCET 2018
13
The electronic configuration of transition element " $X$ ", $[\mathrm{Ar}] 3 d^5$ is oxidation state is +3 . What is its atomic number?
KCET 2018
14
The electronegativities of $\mathrm{C}, \mathrm{N}, \mathrm{Si}$ and P are in the order of
KCET 2017
15
Which one of the following noble gas has an unusual property of diffusing through the materials such as rubber, glass or plastic?
KCET 2017
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