Embibe Experts Solutions for Chapter: The d- and f-Block Elements, Exercise 1: KCET (UG) 2018

${\mathrm{Cu}}_2{\mathrm{Cl}}_2$ and ${\mathrm{CuCl}}_2$ in aqueous medium

Which of the following is an amphoteric oxide?

The electronic configuration of the transition element ${}^{\text{'}\text{'}}\mathrm{X}^{\text{'}\text{'}}$ is $\left[\mathrm{Ar}\right]3{\mathrm{d}}^5$ , and the oxidation state is $+3$. What is its atomic number?

Which of the following does not represent property stated against it?

Which one of the following is correct for all elements from $\mathrm{Sc}$ to $\mathrm{Cu}?$

Which of the following pairs has both the ions coloured in aqueous solution?  [Atomic numbers of

$[\mathrm{Sc}=21, \mathrm{Ti}=22, \mathrm{Ni}=28, \mathrm{Cu}=29, \mathrm{Mn}=25]$

Aqueous solution of a salt $\left(\mathrm{A}\right)$ forms a dense white precipitate with ${\mathrm{BaCl}}_2$ solution. The precipitate dissolves in dilute $\mathrm{HCl}$ to produce a gas $\left(\mathrm{B}\right)$ which decolourises acidified ${\mathrm{KMnO}}_4$ solution. $\mathrm{A}$ and $\mathrm{B}$ respectively are :

${\mathrm{KMnO}}_4$ acts as an oxidizing agent in alkaline medium. When alkaline ${\mathrm{KMnO}}_4$ is treated with $\mathrm{KI}$, iodide ion is oxidized to