Qualitative Analysis

Among PbS, CuS, HgS, MnS, $\ce{Ag2S}$, NiS, CoS, $\ce{Bi2S3}$ and $\ce{SnS2}$, the total number of BLACK coloured sulfides is

Reagent S is

Upon treatment with ammoniacal $\ce{H2S}$, the metal ion that precipitates as a sulfide is

The precipitate P contains

The coloured solution S contains

Which of the following hydrogen halides react(s) with $\ce{AgNO3}$(aq) to give a precipitate that dissolves in $\ce{Na2S2O3}$(aq)?

For the given aqueous reactions, which of the statement(s) is (are) true?

$\ce{AgNO3}$(aq.) was added to an aqueous KCl solution gradually and the conductivity of the solution was measured. The plot of conductance ($\Lambda$) versus the volume of $\ce{AgNO3}$ is

The metal rod M is

The compound N is

The final solution contains

Passing $\ce{H2S}$ gas into a mixture of $\ce{Mn^{2+}}$, $\ce{Ni^{2+}}$, $\ce{Cu^{2+}}$ and $\ce{Hg^{2+}}$ ions in an acidified aqueous solution precipitates

The compound X is

The compound Y is

The compound Z is

A solution of colourless salt H on boiling with excess NaOH produces a non-flammable gas. The gas evolution ceases after sometime. Upon addition of Zn dust to the same solution, the gas evolution restarts. The colourless salt(s) H is (are)

STATEMENT-1: $\ce{[Fe(H2O)5NO]SO4}$ is paramagnetic.

and

STATEMENT-2: The Fe in $\ce{[Fe(H2O)5NO]SO4}$ has three unpaired electrons.

Match the compounds in Column I with their characteristic test(s)/reaction(s) given in Column II. Indicate your answer by darkening the appropriate bubbles of the 4 × 4 matrix given in the ORS.

A solution of a metal ion when treated with KI gives a red precipitate which dissolves in excess KI to give a colourless solution. Moreover, the solution of metal ion on treatment with a solution of cobalt(II) thiocyanate gives rise to a deep blue crystalline precipitate. The metal ion is

Match the reactions in Column I with nature of the reactions/type of the products in Column II. Indicate your answer by darkening the appropriate bubbles of the 4 × 4 matrix given in the ORS.