d- and f-Block Elements

The dark purple colour of $\mathrm{KMnO_4}$ disappears in the titration with oxalic acid in acidic medium. The overall change in the oxidation number of manganese in the reaction is :

The products obtained from a reaction of hydrogen peroxide and acidified potassium permanganate are

The spin-only magnetic moment value of the compound with strongest oxidizing ability among $\mathrm{MnF_4}$, $\mathrm{MnF_3}$ and $\mathrm{MnF_2}$ is ______ B.M. [nearest integer]

Given below are two statements.

Statement I: Iron (III) catalyst, acidified $\mathrm{K_2Cr_2O_7}$ and neutral $\mathrm{KMnO_4}$ have the ability to oxidise $\mathrm{I^-}$ to $\mathrm{I_2}$ independently.

Statement II: Manganate ion is paramagnetic in nature and involves $p\pi-p\pi$ bonding.

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

The total number of Mn=O bonds in $\mathrm{Mn_2O_7}$ is ______.

In neutral or alkaline solution, $\mathrm{MnO_4^-}$ oxidises thiosulphate to :

The oxidation state of manganese in the product obtained in a reaction of potassium permanganate and hydrogen peroxide in basic medium is ______.

Match List - I with List - II, match the gas evolved during each reaction.

Choose the correct answer from the options given below :

Which of the following has least tendency to liberate $\mathrm{H_2}$ from mineral acids ?

The disproportionation of $\mathrm{MnO_4^{2-}}$ in acidic medium resulted in the formation of two manganese compounds A and B. If the oxidation state of Mn in B is smaller than that of A, then the spin-only magnetic moment (μ) value of B in BM is ______. (Nearest integer)

Which of the following pair is not isoelectronic species?

(At. no. Sm, 62; Er, 68; Yb, 70; Lu, 71; Eu, 63; Tb, 65; Tm, 69)

Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R

Assertion A : Permanganate titrations are not performed in presence of hydrochloric acid.

Reason R : Chlorine is formed as a consequence of oxidation of hydrochloric acid.

In the light of the above statements, choose the correct answer from the options given below

The reaction of zinc with excess of aqueous alkali, evolves hydrogen gas and gives :

In following pairs, the one in which both transition metal ions are colourless is :

In neutral or faintly alkaline medium, $\mathrm{KMnO_4}$ being a powerful oxidant can oxidize, thiosulphate almost quantitatively, to sulphate. In this reaction overall change in oxidation state of manganese will be :

Which of the following 3d-metal ion will give the lowest enthalpy of hydration ($\Delta_{hyd}H$) when dissolved in water ?

The number of coloured and paramagnetic ions from the following in aqueous solution are _______.

Ti$^{3+}$, Co$^{2+}$, Ni$^{2+}$, Cu$^{2+}$, Cu$^+$, Ti$^{4+}$, Zn$^{2+}$, Sc$^{3+}$

Given Atomic no. Sc, 21; Ti, 22; Co, 27; Ni, 28; Cu, 29; Zn, 30

Precipitate $\mathbf X$ is

The electrode potential of M$^{2+}$/M of 3d-series elements shows positive value for :

The major components in "Gun Metal" are :