Academic Experts Solutions for Chapter: Qualitative Analysis, Exercise 1: Exercise

A white crystalline solid $\left(\mathrm{A}\right)$ on boiling with caustic soda solution gave a gas $\left(\mathrm{B}\right)$, which when passed through an alkaline solution of potassium mercuric iodide gave brown precipitate. The substance $\left(\mathrm{A}\right)$ on heating gave a gas $\left(\mathrm{X}\right)$, which rekindled a glowing splinter but did not give brown fumes with nitric oxide. The gas $\left(\mathrm{B}\right)$ is:

An aqueous solution of compound '$\mathrm{A}$' gives white precipitate with $2 \mathrm{M} \mathrm{HCl}$. The precipitate becomes black on addition of aqueous ${\mathrm{NH}}_3$ due to formation of '$\mathrm{B}$'. '$\mathrm{B}$' dissolves in aqua regia. '$\mathrm{A}$' and '$\mathrm{B}$' are

A compound $\left(\mathrm{X}\right)$ reacts in the following ways.

The compound $\left(\mathrm{X}\right)$ is likely to be:

To a solution of a substance, gradual addition of ammonium hydroxide results in a brownish black precipitate which does not dissolve in excess of ${\mathrm{NH}}_4\mathrm{OH}$. However, when $\mathrm{KI}$ (not in excess) is added to the original solution, a green precipitate is formed. The solution contained:

Black precipitate of copper sulphide dissolves in

Which of the following metal salts gives a red and opaque borax bead in the reducing flame (in cold)?

Which one among the following pairs of ions cannot be separated by ${\mathrm{H}}_2\mathrm{S}$ in dilute hydrochloric acid?

The reagents, ${\mathrm{NH}}_4\mathrm{Cl}$ and aqueous ${\mathrm{NH}}_3$ will precipitate: