Embibe Experts Solutions for Chapter: Classification of Elements and Periodicity in Properties, Exercise 1: BEGINNER'S BOX

The screening effect of $\mathrm{d}-$electrons is

IE₁ and IE₂ of $\mathrm{Mg}$ are $179$ and $348 \mathrm{kcal} {\mathrm{mol}}^{-1}$ respectively. The energy required for the reaction $\mathrm{Mg} \to {\mathrm{Mg}}^{2+}+ 2{\mathrm{e}}^{-}$ is 

Which of the following configuration will have least electron affinity $\left(\mathrm{n}=2\right)$?

The outermost electronic configuration of the most electronegative element is

Which of the following complexes, is an inner $\mathrm{d}-$orbital complex :

Which of the following is/are Dobereiners triad:

$\left(\mathrm{a}\right) \mathrm{P}, \mathrm{As}, \mathrm{Sb}$

$\text{(b) }\mathrm{Cu},\mathrm{Ag},\mathrm{Au}$

$\text{(c) }\mathrm{Fe},\mathrm{Co},\mathrm{Ni}$

$\left(\mathrm{d}\right) \mathrm{S}, \mathrm{Se}, \mathrm{Te}$

Correct answer is:

Which is not anomalous pair of elements in the Mendeleev's periodic table:-

The law of triads is applicable to:-