d- and f-Block Elements

In the scheme given below, X and Y, respectively, are

The treatment of an aqueous solution of 3.74 g of $\ce{Cu(NO3)2}$ with excess KI results in a brown solution along with the formation of a precipitate. Passing $\ce{H2S}$ through this brown solution gives another precipitate X. The amount of X (in g) is _____.

[Given: Atomic mass of H = 1, N = 14, O = 16, S = 32, K = 39, Cu = 63, I = 127]

The difference in oxidation state of chromium in chromate and dichromate salts is ______.

Metals generally melt at very high temperature. Amongst the following, the metal with the highest melting point will be

Manganese (VI) has ability to disproportionate in acidic solution. The difference in oxidation states of two ions it forms in acidic solution is ______.

Cerium (IV) has a noble gas configuration. Which of the following is correct statement about it ?

Among the following, which is the strongest oxidizing agent ?

The metal ion (in gaseous state) with lowest spin-only magnetic moment value is

The spin-only magnetic moment value of the most basic oxide of vanadium among $\mathrm{V_2O_3}$, $\mathrm{V_2O_4}$ and $\mathrm{V_2O_5}$ is ______ B.M. (Nearest integer)

The most common oxidation state of Lanthanoid elements is +3. Which of the following is likely to deviate easily from +3 oxidation state?

The number of statement(s) correct from the following for Copper (at. no. 29) is/are ______.

(A) Cu(II) complexes are always paramagnetic

(B) Cu(I) complexes are generally colourless

(C) Cu(I) is easily oxidized

(D) In Fehling solution, the active reagent has Cu(I)

Acidified potassium permanganate solution oxidises oxalic acid. The spin-only magnetic moment of the mangenese product formed from the above reaction is ______ B.M. (Nearest Integer)

In 3d series, the metal having the highest $\mathrm{M^{2+}/M}$ standard electrode potential is

The 'f' orbitals are half and completely filled, respectively in lanthanide ions

[Given : Atomic no. Eu, 63; Sm, 62; Tm, 69; Tb, 65; Yb, 70; Dy, 66]

Which one of the lanthanoids given below is the most stable in divalent form?

The electronic configuration of Pt (atomic number 78) is :

The number of terminal oxygen atoms present in the product B obtained from the following reaction is ______.

$$\mathrm{FeCr_2O_4+Na_2CO_3+O_2\rightarrow A+Fe_2O_3+CO_2}$$
$$\mathrm{A+H^+\rightarrow B+H_2O+Na^+}$$

An acidified manganate solution undergoes disproportionation reaction. The spin-only magnetic moment value of the product having manganese in higher oxidation state is ______ B.M. (Nearest integer)

Among $\mathrm{Co^{3+}}$, $\mathrm{Ti^{2+}}$, $\mathrm{V^{2+}}$ and $\mathrm{Cr^{2+}}$ ions, one if used as a reagent cannot liberate $\mathrm{H_2}$ from dilute mineral acid solution, its spin-only magnetic moment in gaseous state is ______ B.M. (Nearest integer)

The spin-only magnetic moment value of $\mathrm{M^{3+}}$ ion (in gaseous state) from the pairs $\mathrm{Cr^{3+}/Cr^{2+}}$, $\mathrm{Mn^{3+}/Mn^{2+}}$, $\mathrm{Fe^{3+}/Fe^{2+}}$ and $\mathrm{Co^{3+}/Co^{2+}}$ that has negative standard electrode potential, is ______ B.M. [Nearest integer]