Embibe Experts Solutions for Chapter: The d- and f-block Elements, Exercise 1: WBJEE 2018

The nucleus ${}_{29}{}^{64}\mathrm{Cu}$ accepts an orbital electron to yield,

The second ionisation energy of the following elements follows the order

A copper coin was electroplated with $\mathrm{Zn}$ and then heated at high temperature until there is a change in colour. What will be the resulting colour?

Out of the following outer electronic configurations of atoms, the highest oxidation state is achieved by which one ?

To a solution of a colourless efflorescent sodium salt, when dilute acid is added, a colourless gas is evolved along with formation of a white precipitate. Acidified dichromate solution turns green, when the colourless gas is passed through it. The sodium salt is

$\left[\mathrm{X}\right]+$ dil. ${\mathrm{H}}_2{\mathrm{SO}}_4⟶\left[\mathrm{Y}\right]:$ Colourless, suffocating gas

$\left[\mathrm{Y}\right]+{\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7+{\mathrm{H}}_2{\mathrm{SO}}_4⟶$ Green colouration of solution

Then, $\left[\mathrm{X}\right]$ and $\left[\mathrm{Y}\right]$ are

The number of unpaired electrons in the uranium $\left({}_{92}\mathrm{U}\right)$ atom is

Which atomic species cannot be used as a nuclear fuel?