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

${\mathrm{FeCl}}_3·6{\mathrm{H}}_2\mathrm{O}+\mathrm{C}{\left({\mathrm{CH}}_3\right)}_2{\left({\mathrm{CH}}_3\mathrm{O}\right)}_2\to$ Products

Reaction products are

${\left({\mathrm{NH}}_4\right)}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$ (Ammonium dichromate) is used in fire works. The green coloured powder blown in air is:

$\mathrm{x}, \mathrm{y}$ and $\mathrm{z}$ Are respectively :

Increasing value of magnetic moment of following species is

$\mathrm{I}$. ${\left[\mathrm{Fe}(\mathrm{CN}{)}_6\right]}^{4-}II·{\left[\mathrm{Fe}(\mathrm{CN}{)}_6\right]}^{3-}$ $\mathrm{III}$. ${\left[\mathrm{Cr}{\left({\mathrm{NH}}_3\right)}_6\right]}^{3+} IV·{\left[\mathrm{Ni}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{2+}$

A black mineral $\left(A\right)$ on heating in the presence of air gives a pungent smelling gas$\left(B\right)$. $\left(A\right)$ on reaction with dilute ${\mathrm{H}}_2{\mathrm{SO}}_4$ gives gas$\left(C\right)$ and a solution of compound$\left(D\right)$. On passing gas $\left(C\right)$ into aqueous solution of $\left(B\right)$, a white turbidity is obtained. The aqueous solution of $\left(D\right)$ on reaction with ${\mathrm{K}}_3\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_6\right]$ gives a blue precipitate$\left(E\right)$. Compound $\left(D\right)$ and $\left(E\right)$ are respectively.

A black mineral $\left(\mathrm{A}\right)$ in solid state is fused with $\mathrm{KOH}$ and ${\mathrm{KNO}}_3$ and the mixture extracted with water to get a green coloured solution $\left(\mathrm{B}\right)$. On passing ${\mathrm{CO}}_2$ gas through the solution the colour changes to pink with a black residue $\left(\mathrm{C}\right)$. Which of the following is/are correct

Identify the total number of compounds which does not make yellow precipitate with $2,4$-DNP but show positive test with cold alkaline ${\mathrm{KMnO}}_4$.

How many number of following ions for which all octahedral complexes are paramagnetic irrespective of ligand ${\mathrm{Sc}}^{3+},{\mathrm{Ti}}^{3+},{\mathrm{V}}^{3+},{\mathrm{Cr}}^{3+},{\mathrm{Mn}}^{3+},{\mathrm{Fe}}^{3+},{\mathrm{Co}}^{3+},{\mathrm{Ni}}^{3+}$