Embibe Experts Solutions for Chapter: d-and f-Block Elements, Exercise 1: ICSE-2018

Complete and balance the following reaction: 

$\mathrm{NaCl} + {\mathrm{MnO}}_2 + {\mathrm{H}}_2{\mathrm{SO}}_4 \to$ _______ $+$ _______ $+$ ________ $+$ _____.

Complete and balance the following reaction: 

${\mathrm{KMnO}}_4 + {\mathrm{SO}}_2 + {\mathrm{H}}_2\mathrm{O} \to$ _______ $+$ _______ $+$ ________ .

Which trivalent ion has a maximum size in the Lanthanoid series i.e., Lanthanum ion (${\mathrm{La}}^{+3}$) to Lutetium ion (${\mathrm{Lu}}^{3+}$)? (atomic number of Lanthanum $= 57$ and Lutetium $= 71$)

Explain why ${\mathrm{Cu}}^{2+}$ is paramagnetic but ${\mathrm{Cu}}^{+}$ is diamagnetic.
(atomic number of $\mathrm{Cu}=29$)

Why ${\mathrm{Zn}}^{2+}$ ions are colourless while ${\mathrm{Ni}}^{2+}$ ions are green and ${\mathrm{Cu}}^{2+}$ ions are blue in colour?

Explain the transition metals and their compounds generally exhibit a paramagnetic behaviour.

Explain the following: There is an increase in density of elements from titanium ($\mathrm{Z}=22$) to copper ($\mathrm{Z}=29$) in the $3\mathrm{d}-$series of transition elements.

Explain the following: ${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$ acts as a powerful oxidising agent in acidic medium.