Coordination Compounds

The stepwise formation of [Cu(NH$_3$)$_4$]$^{2+}$ is given below :

$\mathrm{Cu^{2+}+NH_3\overset{K_1}{\rightleftharpoons}[Cu(NH_3)]^{2+}}$
$\mathrm{[Cu(NH_3)]^{2+}+NH_3\overset{K_2}{\rightleftharpoons}[Cu(NH_3)_2]^{2+}}$
$\mathrm{[Cu(NH_3)_2]^{2+}+NH_3\overset{K_3}{\rightleftharpoons}[Cu(NH_3)_3]^{2+}}$
$\mathrm{[Cu(NH_3)_3]^{2+}+NH_3\overset{K_4}{\rightleftharpoons}[Cu(NH_3)_4]^{2+}}$

The value of stability constants K$_1$, K$_2$, K$_3$ and K$_4$ are 10$^4$, $1.58\times10^3$, $5\times10^2$ and 10$^2$ respectively. The overall equilibrium constants for dissociation of [Cu(NH$_3$)$_4$]$^{2+}$ is $x\times10^{-12}$. The value of $x$ is _______. (Rounded off to the nearest integer)

Choose the correct statement(s) among the following:

In an experiment, $m$ grams of a compound X (gas/liquid/solid) taken in a container is loaded in a balance as shown in figure I below. In the presence of a magnetic field, the pan with X is either deflected upwards (figure II), or deflected downwards (figure III), depending on the compound X. Identify the correct statement(s).

The cyanide process of gold extraction involves leaching out gold from its ore with $\ce{CN-}$ in the presence of Q in water to form R. Subsequently, R is treated with T to obtain Au and Z. Choose the correct option(s)

Total number of cis N-Mn-Cl bond angles (that is, Mn-N and Mn-Cl bonds in cis positions) present in a molecule of cis-$\ce{[Mn(\mathit{en})2Cl2]}$ complex is ______ ($en = \ce{NH2CH2CH2NH2}$)

The correct statement(s) regarding the binary transition metal carbonyl compounds is (are) (Atomic numbers: Fe = 26, Ni = 28)

Among the species given below, the total number of diamagnetic species is ______.

H atom, $\ce{NO2}$ monomer, $\ce{O2-}$ (superoxide), dimeric sulphur in vapour phase, $\ce{Mn3O4}$, $\ce{(NH4)2[FeCl4]}$, $\ce{(NH4)2[NiCl4]}$, $\ce{K2MnO4}$, $\ce{K2CrO4}$

The ammonia prepared by treating ammonium sulphate with calcium hydroxide is completely used by $\ce{NiCl2.6H2O}$ to form a stable coordination compound. Assume that both the reactions are 100% complete. If 1584 g of ammonium sulphate and 952 g of $\ce{NiCl2.6H2O}$ are used in the preparation, the combined weight (in grams) of gypsum and the nickel-ammonia coordination compound thus produced is ______.

(Atomic weights in g mol⁻¹: H = 1, N = 14, O = 16, S = 32, Cl = 35.5, Ca = 40, Ni = 59)

The correct option(s) regarding the complex $[\mathrm{Co(en)(NH_3)_3(H_2O)}]^{3+}$ (en = $\mathrm{H_2NCH_2CH_2NH_2}$) is (are)

Match each set of hybrid orbitals from LIST-I with complex(es) given in LIST-II.

The correct option is

Addition of excess aqueous ammonia to a pink coloured aqueous solution of $\ce{MCl2.6H2O}$ (X) and $\ce{NH4Cl}$ gives an octahedral complex Y in the presence of air. In aqueous solution, complex Y behaves as 1:3 electrolyte. The reaction of X with excess HCl at room temperature results in the formation of a blue coloured complex Z. The calculated spin only magnetic moment of X and Z is 3.87 B.M., whereas it is zero for complex Y.

Among the following options, which statement(s) is(are) correct?

On treatment of 100 mL of 0.1 M solution of $\ce{CoCl3.6H2O}$ with excess $\ce{AgNO3}$; $1.2\times10^{22}$ ions are precipitated. The complex is :

$sp^3d^2$ hybridization is not displayed by :

$\ce{[Co2(CO)8]}$ displays :

Among $\ce{[Ni(CO)4]}$, $\ce{[NiCl4]^{2-}}$, $\ce{[Co(NH3)4Cl2]Cl}$, $\ce{Na3[CoF6]}$, $\ce{Na2O2}$ and $\ce{CsO2}$, the total number of paramagnetic compounds is

The number of geometric isomers possible for the complex $\ce{[CoL2Cl2]^-}$ $(\mathrm L=\ce{H2NCH2CH2O^-})$ is

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 geometries of the ammonia complexes of $\ce{Ni^{2+}}$, $\ce{Pt^{2+}}$ and $\ce{Zn^{2+}}$, respectively, are

The pair having the same magnetic moment is :

[At. No. : Cr = 24, Mn = 25, Fe = 26, Co = 27]

Which one of the following complexes shows optical isomerism ?

(en = ethylenediamine)