Tests for Iron(III) Ion

Prolongated heating of ferrous ammonium sulphate is avoided to prevent 

Consider following sequence of chemical reactions that have been carried out in laboratory.

(i) Unknown salt '$\mathrm{A}$' $+{\mathrm{Na}}_2{\mathrm{CO}}_3\left(\mathrm{s}\right)+$ Distilled water $\underset{\mathrm{filtre}}{\overset{\mathrm{Boil} \mathrm{and}}{\to }}\underset{\mathrm{ppt}}{B}\downarrow +C$

(ii) '$\mathrm{C}$'$+{\mathrm{Cr}}_2{\mathrm{O}}_7{}^{2-}\left(\mathrm{aq}\right)+{\mathrm{H}}^{+}\left(\mathrm{aq}\right)⟶$ Colour of ${\mathrm{Cr}}_2{\mathrm{O}}_7^{2-}$ remains same (No reaction)

(iii) $\mathrm{B}\downarrow +$ dil. $\mathrm{HCl}⟶$ Coloured solution $\stackrel{{\mathrm{NH}}_4\mathrm{Cl}+{\mathrm{NH}}_4\mathrm{OHsol}.}{\to }\underset{\left(\mathrm{precipitate}\right)}{D\downarrow }$

Then the unknown salt '$\mathrm{A}$' is:

An inorganic salt(S) reacts with ${\mathrm{BaCl}}_2$ solution to produce ppt. $\left(\mathrm{P}\right)$ which is insoluble in dil. $\mathrm{HCl}$. Acidified green coloured aqueous solution of salt (S) is converted to yellow on long exposure of air, on bubbling ${\mathrm{H}}_2\mathrm{S}$ in yellow solution elemental sulphur is produced.
Select CORRECT for given reactions.

On reaction of sodium hydroxide with Iron $\left(\mathrm{III}\right)$ ion gives a pink coloured precipitate.

On reaction of sodium hydroxide with Iron $\left(\mathrm{III}\right)$ ion gives a coloured precipitate. Identify the colour.

On adding sodium hydroxide drop by drop to a solution of ferrous sulphate, a dirty green precipitate is formed. Write the chemical formula of the compound formed of this colour.

$\mathrm{A}: \mathrm{Fe}{\left(\mathrm{OH}\right)}_3 \mathrm{B}: \mathrm{Fe}{\left(\mathrm{OH}\right)}_2 \mathrm{C}: {\mathrm{Fe}}_2{\mathrm{O}}_3 \mathrm{D}: \mathrm{FeO}$ (Enter your correct answer as $\mathrm{A}, \mathrm{B}, \mathrm{C} \mathrm{or} \mathrm{D}$)

Ammonium hydroxide reacts to distinguish $\mathrm{F}\mathrm{e}\mathrm{C}{\mathrm{l}}_2$ solution from $\mathrm{F}\mathrm{e}\mathrm{C}{\mathrm{l}}_3$ solution.

The colour of precipitate formed when sodium hydroxide is added to a solution of ferric chloride is _____.

A substance X is a yellow solution and gives a reddish-brown precipitate Y which remains insoluble in excess Ammonium hydroxide. Identify the substances X and Y and also write the complete balanced equation.

Match the following: 

How many of the given cations will give green colour in Borax bead test?

$\mathrm{Fe}, \mathrm{Co}, \mathrm{Mn}, \mathrm{Ni}$

colour of is

A pale green crystalline metallic salt dissolves freely in water and gives a brown precipitate on addition of aqueous $NaOH.$ The metallic salt solution also gives a black precipitate on bubbling $H_{2}S$ in acidic medium. An aqueous solution of this decolourises the purple colour of the permanganate solution. The metal in the metallic salt solution is:

Consider the following statements,
S₁ : Fe(OH)₃ and Cr(OH)₃ precipitates can be separated using NaOH + H₂O₂ but not by excess of NaOH alone.

S₂ : Ag₂CrO₄ precipitate is soluble in dilute HNO₃ and ammonia solution.

S₃ : both HgI₂ and BiI₃ precipitates form colourless soluble complexes with excess of potassium iodide solution.

S₄ : white precipitate of PbCl₂ is turned black by H₂S (not taken in excess) in saturated solution of KCl.

and arrange in the order of true / false.

Ferric ion forms a Prussian blue precipitate due to the formation of:

A compound is soluble in water. If ammonia is added, a red precipitate appears which is soluble in dilute $\mathrm{HCl}$. The compound has

A reagent which produces a dark blue precipitate with $F{e}^{2+}$ is :

Which of the following pairs of ions when mixed in dilute solutions may give precipitate ?

$Fe{\left(OH\right)}_3$ can be separated from $Al{\left(OH\right)}_3$ by addition of

A light greenish coloured salt was soluble in water. On passing $H_{2}S$ into the solution a black precipitate was obtained which dissolve readily in $HCl$ . The metal ion present is