M K Verma Solutions for Chapter: Classification of Elements and Periodicity in Properties, Exercise 1: TOPICWISE QUESTIONS

The most electropositive element among the following elements of the third period is

The ground state electronic configuration of elements $\mathrm{U}, \mathrm{V}, \mathrm{W}, \mathrm{X}$ and $\mathrm{Y}$ (these symbols do not have any chemical significance) are as follows:

$\mathrm{U}: 1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^3$

$\mathrm{V}: 1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^{6}3{\mathrm{s}}^1$

$\mathrm{W}: 1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^{6}3{\mathrm{s}}^{2}3{\mathrm{p}}^2$

$\mathrm{X}: 1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^{6}3{\mathrm{s}}^{2}3{\mathrm{p}}^{6}3{\mathrm{d}}^{5}4{\mathrm{s}}^2$

$\mathrm{Y}: 1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^{6}3{\mathrm{s}}^{2}3{\mathrm{p}}^{6}3{\mathrm{d}}^{10}4{\mathrm{s}}^{2}4{\mathrm{p}}^6$

Determine which sequence of elements satisfy the following statements?

An element forms a carbonate which is not decomposed by heating.

An element is most likely to form coloured ionic compounds.

An element has a largest atomic radius.

Element forms only acidic oxides.

Which of the following statements is/are incorrect?

Identify the correct order of solubility in aqueous medium.

Stability order of $+3$ and $+1$ states of group $\mathrm{IIIA}$ (Boron family) element is

The solubility of sulphates of alkaline earth metals in water shows the order

The ionization energy of ${\mathrm{He}}^{+}$ is $19.6\times {10}^{-18} \mathrm{J} {\mathrm{atom}}^{-1}.$ The energy of the first stationary state $(\mathrm{n}=1)$ of ${\mathrm{Li}}^{2+}$ is:

The energy of an electron in a hydrogen-like is given by ${\mathrm{E}}_{\mathrm{n}}=-\left(2.18\times {10}^{-18}\right)\left(\frac{{\mathrm{Z}}^2}{{\mathrm{n}}^2}\right).$

Whereas: $\mathrm{n}$ is the principal quantum number and $\mathrm{Z}$ is the atomic number of the element.

The ionization energy (in $\mathrm{kJ} {\mathrm{mol}}^{-1}$) of the ${\mathrm{Li}}^{2+}$ ion is