d and f Block Elements

The pair(s) of diamagnetic ions is(are)

In the scheme given below, $\mathbf{X}$ and $\mathbf{Y}$, respectively, are

Thermal decomposition of $\mathrm{AgNO}_{3}$ produces two paramagnetic gases. The total number of electrons present in the antibonding molecular orbitals of the gas that has the higher number of unpaired electrons is ____________.

The reaction of $\mathrm{Xe}$ and $\mathrm{O}_{2}{F}_{2}$ gives a $\mathrm{Xe}$ compound $\mathbf{P}$. The number of moles of $\mathrm{HF}$ produced by the complete hydrolysis of $1 \mathrm{~mol}$ of $\mathbf{P}$ is __________.

The treatment of galena with $\mathrm{HNO}_{3}$ produces a gas that is

An acidified solution of potassium chromate was layered with an equal volume of amyl alcohol. When it was shaken after the addition of 1 mL of 3% H2O2, a blue alcohol layer was obtained. The blue colour is due to the formation of a chromium...

With reference to aqua-regia, choose the correct option(s).

Fusion of MnO2 with KOH in presence of O2 produces a salt W. Alkaline solution of W upon electrolytic oxidation yields another salt X. The manganese containing ions present in W and X, respectively, are Y and Z. Correct statement(s) is (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 \(M{n^{2 + }}\) and \(C{u^{2 + }}\) taken separately is (are)

Among the species given below, the total number of diamagnetic species is _____________.
\(H\) atom, \(N{O_2}\) monomer, \({O_2}^ -\) (superoxide), dimeric sulphur in vapor phase, \(M{n_3}{O_4},\,\,\) $${\left( {N{H_4}} \right)_2}\left[ {F...

The options(s) with only amphoteric oxides is (are)

Which of the following combination will produce \({H_2}\) gas ?

In the following reaction, sequence in aqueous solution, the species X, Y and Z, respectively, are
$${S_2}O_3^{2 - }\buildrel {A{g^ + }} \over
\longrightarrow \mathop X\limits_{Clear\,solution} \buildrel {A{g^ + }} \over
\longrightarrow \...

The reagent(s) that can selectively precipitate S2- from a mixture of S2- and SO42- in aqueous solution is (are) :

The pairs of ions where BOTH the ions are precipitated upon passing H2S gas in presence of dilute HCl, is(are)

The correct statements about Cr2+ and Mn3+ is(are) (Atomic numbers of Cr = 24 and Mn = 25)

Upon heating with Cu2S, the reagent(s) that give copper metal is/are

Among PbS, CuS, HgS, MnS, Ag2S, NiS, CoS, Bi2S3 and SnS2 the total number of black coloured sulphides is

The pair(s) of reagents that yield paramagnetic species is/are

Upon treatment with ammoniacal H2S, the metal ion that precipitates as a sulphide is

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

The colour of light absorbed by an aqueous solution of CuSO4 is

The oxidation number of Mn in the product of alkaline oxidative fusion of MnO\(_2\) is ___________.

Write the balanced chemical equation for developing a back and white photographic film. Also explain why the solution of sodium thiosulphate on acidification turns milky white.