Periodic Table and Periodicity · Chemistry · KCET
MCQ (Single Correct Answer)
$$ \text { Given below and the atomic masses of the elements: } $$
$$ \begin{array}{|l|l|l|l|l|l|l|l|l|l|} \hline \text { Element: } & \mathrm{Li} & \mathrm{Na} & \mathrm{Cl} & \mathrm{~K} & \mathrm{Ca} & \mathrm{Br} & \mathrm{Sr} & \mathrm{I} & \mathrm{Ba} \\ \hline \text { Atomic Mass }\left(\mathrm{g} \mathrm{~mol}^{-1}\right): & 7 & 23 & 35.5 & 39 & 40 & 80 & 88 & 127 & 137 \\ \hline \end{array} $$
$$ \text { Which of the following doesn't form triad? } $$The correct order of first ionisation enthalpy of given elements is
A pair of amphoteric oxides is
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?
Amphoteric oxide among the following
The property of halogens which is not correctly matched is
Which noble gas has least tendency to form compounds?
Elements $$X, Y$$ and $$Z$$ have atomic numbers 19, 37 and 55 respectively. Which of the following statements is true about them ?
The third ionisation enthalpy is highest in
The first ionisation enthalpy of the following elements are in the order :