Qualitative Analysis

$\mathrm{Fe^{3+}}$ cation gives a prussian blue precipitate on addition of potassium ferrocyanide solution due to the formation of :

When borax is heated with CoO on a platinum loop, blue coloured bead formed is largely due to

In the ring test of NO$_3^-$ ion what is the oxidation number of iron in the complex (brown ring) [Fe(H$_2$O)$_5$NO]SO$_4$ ?

A mixture of two salts is used to prepare a solution $\mathbf S$, which gives the following results:

• $\mathbf S$ (aq solution of the salts) + dilute NaOH(aq), room temperature → white precipitate(s) only
• $\mathbf S$ + dilute HCl(aq), room temperature → white precipitate(s) only

The correct option(s) for the salt mixture is(are)

Precipitate $\mathbf X$ is

Among the following, the brown ring is due to the formation of

Given below are two statements :

Statement I : Colourless cupric metaborate is reduced to cuprous metaborate in a luminous flame.

Statement II : Cuprous metaborate is obtained by heating boric anhydride and copper sulphate in a non-luminous flame.

In the light of the above statements, choose the most appropriate answer from the options given below.

A colorless aqueous solution contains nitrates of two metals, X and Y. When it was added to an aqueous solution of NaCl, a white precipitate was formed. This precipitate was found to be partly soluble in hot water to give a residue P and a solution Q. The residue P was soluble in aq. $\ce{NH3}$ and also in excess sodium thiosulfate. The hot solution Q gave a yellow precipitate with KI. The metals X and Y, respectively, are

The green colour produced in the borax bead test of a chromium(III) salt is due to

The correct option(s) to distinguish nitrate salts of $\mathrm{Mn^{2+}}$ and $\mathrm{Cu^{2+}}$ taken separately is (are)

Sodium salt of an organic acid 'X' produces effervescence with conc. $\ce{H2SO4}$. 'X' reacts with the acidified aqueous $\ce{CaCl2}$ solution to give a white precipitate which decolourises acidic solution of $\ce{KMnO4}$. 'X' is :

A metal 'M' reacts with nitrogen gas to afford '$\ce{M3N}$'. '$\ce{M3N}$' on heating at high temperature gives back 'M' and on reaction with water produces a gas 'B'. Gas 'B' reacts with aqueous solution of $\ce{CuSO4}$ to form a deep blue compound. 'M' and 'B' respectively are :

A solution containing a group-IV cation gives a precipitate on passing $\ce{H2S}$. A solution of this precipitate in dil.HCl produces a white precipitate with NaOH solution and bluish-white precipitate with basic potassium ferrocyanide. The cation is :

The reagent(s) that can selectively precipitate $\ce{S^{2-}}$ from a mixture of $\ce{S^{2-}}$ and $\ce{SO4^{2-}}$ in aqueous solution is(are)

In the following reaction sequence in aqueous solution, the species X, Y and Z, respectively, are
$$\ce{S2O3^{2-}}\xrightarrow{\ce{Ag+}}\underset{\text{clear solution}}{\mathbf X}\xrightarrow{\ce{Ag+}}\underset{\text{white precipitate}}{\mathbf Y}\xrightarrow{\text{with time}}\underset{\text{black precipitate}}{\mathbf Z}$$

The pair(s) of ions where BOTH the ions are precipitated upon passing $\ce{H2S}$ gas in presence of dilute HCl, is(are)

Which of the following compounds is not colored yellow ?

An aqueous solution of a salt X turns blood red on treatment with $\ce{SCN-}$ and blue on treatment with $\ce{K4[Fe(CN)6]}$. X also gives a positive chromyl chloride test. The salt X is :

The cation that will not be precipitated by $\ce{H2S}$ in the presence of dil HCl is :

A pink coloured salt turns blue on heating. The presence of which cation is most likely ?