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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 ________ \( \text{B. M.} \). [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 terminal oxygen atoms present in the product \( B \) obtained from the following reaction is __________.
\( \mathrm{FeCr_2O_4 + Na_2CO_3 + O_2 \rightarrow A + Fe_2O_3 + CO_2} \)
\( A + \mathrm{H^+} \rightarrow B + \mathrm{H_2O} + \mathrm{Na^+} \)

Among the following, which is the strongest oxidizing agent?

The number of statement(s) correct from the following for Copper (at no. \( 29 \)) is/are_______.
\( (A) \) \( \mathrm{Cu(II)} \) complexes are always paramagnetic
\( (B) \) \( \mathrm{Cu(I)} \) complexes are generally colourless
\( (C) \) \( \mathrm{Cu(I)} \) is easily oxidized
\( (D) \) In Fehling solution, the active reagent has \( \mathrm{Cu(I)} \)

Given below are two statements.
Statement I: Iron (\( \text{III} \)) catalyst, acidified \( \mathrm{K_2Cr_2O_7} \) and neutral \( \mathrm{KMnO_4} \) have the ability to oxidise \( \mathrm{I^-} \) and \( \mathrm{I_2} \) 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:

Acidified potassium permanganate solution oxidises oxalic acid. The spin-only magnetic moment of the manganese product formed from the above reaction is ________ B.M.

Which statement is not true with respect to nitrate ion test?

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

The difference in oxidation state of chromium in eliminate and dichromate salts is ______________.

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

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

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

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:

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

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

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)

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

Manganese \( (\text{VI}) \) has ability to disproportionate in acidic solution. The difference in oxidation states of two ions it forms in acidic solution 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 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:

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JEE Main 2022 29th July Evening shift

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