Embibe Experts Solutions for Chapter: Qualitative Analysis, Exercise 1: Exercise-1

The acidic solution of a salt produces blue colour with $\mathrm{KI}$ starch solution. The reaction indicates the presence of:

Sulphide ion reacts with ${\mathrm{Na}}_2\left[\mathrm{Fe}(\mathrm{CN}{)}_5\mathrm{NO}\right]$ to form a purple coloured compound $\left(\mathrm{X}\right).$ In this reaction oxidation state of iron.

Which of the following pair of anions are identified by conc. ${\mathrm{H}}_2{\mathrm{SO}}_4$?

Which of the following reagents turns white precipitate of $\mathrm{AgCI}$ yellow? 

A unknown salt $\left(\mathrm{S}\right)$ when heated with dil. ${\mathrm{H}}_2{\mathrm{SO}}_4$ does not evolve brown vapours but with conc. ${\mathrm{H}}_2{\mathrm{SO}}_4$ brown vapours are obtained. The vapours when brought in contact with ${\mathrm{AgNO}}_3$ solution do not give any precipitate. The salt $\left(\mathrm{S}\right)$ contains:

$\mathrm{AgCl}$ dissolves in ammonia solution giving:

A colourless solution of a compound gives a precipitate with ${\mathrm{AgNO}}_3$ solution but no precipitate with a solution of ${\mathrm{Na}}_2{\mathrm{CO}}_3.$ The action of concentrated ${\mathrm{H}}_2{\mathrm{SO}}_4$ on the compound liberates a suffocating reddish brown gas. The compound is:

When a mixture containing phosphate is heated with conc. ${\mathrm{HNO}}_3$ and ammonium molybdate solution, a canary yellow precipitate is formed. The formula of the yellow precipitate is: