The D and F-Block Elements

The pair of lanthanoid ions which are diamagnetic is : (2024)

The green paramagnetic species formed by heating \({\mathrm{KMnO}}_{4}\) at 513 K is

[Re-NEET 2026]

The pair of lanthanoid ions which are diamagnetic is

Gadolinium belongs to the 4f series. Its atomic number is 64. Which of the following is the correct electronic configuration of Gadolinium?

The electronic configuration of Gadolinium (Z=64) is:

'Spin only' magnetic moment is same for which of the following ions?

\(A.{\mathrm{Ti}}^{3+}\\ B.{\mathrm{Cr}}^{2+}\\ C.{\mathrm{Mn}}^{2+}\\ D.{\mathrm{Fe}}^{2+}\\ E.{\mathrm{Sc}}^{3+}\)

Choose the most appropriate answer from the options given below:

[NEET 2024]

'Spin only' magnetic moment is same for which of the following ions?

\(A.{\mathrm{Ti}}^{3+}\\ B.{\mathrm{Cr}}^{2+}\\ C.{\mathrm{Mn}}^{2+}\\ D.{\mathrm{Fe}}^{2+}\\ E.{\mathrm{Sc}}^{3+}\)

Choose the most appropriate answer from the options given below:

Which of the following set of ions act as oxidising agents?

[Re-NEET 2024]

The oxidation states not shown by \(\mathrm{Mn}\) in given reaction is

\(3Mn{O}_{4}^{2-}+4{H}^{+}\to 2Mn{O}_{4}^{-}+Mn{O}_{2}+2{H}_{2}O\)
A. +6
B. +2
C. +4
D. +7
E. +3

Choose the most appropriate answer from the options given below

[Re-NEET 2024]

Which of the following set of ions act as oxidising agents?

[NEET-2024]

Which of the following pairs of ions will have same spin only magnetic moment values within the pair?
A. \(Zn ^{2+}, Ti ^{2+}\)
B. \(Cr ^{2+}, Fe ^{2+}\)
C. \(Ti ^{3+}, Cu ^{2+}\)
D. \(V ^{2+}, Cu ^{+}\)

Choose the correct answer from the options given below :

[Re-NEET 2024]

When \(Cu ^{2+}\) ion is treated with \(KI\), a white precipitate, \(X\) appears in solution. The solution is titrated with sodium thiosulphate, the compound \(Y\) is formed. \(X\) and \(Y\) respectively are

Which one of the following lanthanoids does not form \(\mathrm{MO}_2\) ? [ \(\mathrm{M}\) is lanthanoid metal]

[JEE Main 2021, 26 Feb (Shift 1)]

Which of the following statements are INCORRECT?
A. All the transition metals except scandium form MO oxides which are ionic.
B. The highest oxidation number corresponding to the group number in transition metal oxides is attained in \(\mathrm{Sc}_2 \mathrm{O}_3\) to \(\mathrm{Mn}_2 \mathrm{O}_7\).
C. Basic character increases from \(\mathrm{V}_2 \mathrm{O}_3\) to \(\mathrm{V}_2 \mathrm{O}_4\) to \(\mathrm{V}_2 \mathrm{O}_5\).
D. \(\mathrm{V}_2 \mathrm{O}_4\) dissolves in acids to give \(\mathrm{VO}_4^{3-}\) salts.
E. \(\mathrm{CrO}\) is basic but \(\mathrm{Cr}_2 \mathrm{O}_3\) is amphoteric.

Choose the correct answer from the options given below

[NEET-2023]

Which one of the following ions has the maximum magnetic moment?

The standard electrode potential \(\left({M}^{3+}/{M}^{2+}\right)\) for V , Cr , Mn & Co are -0.26 V ,-0.41 V ,+1.57 V and +1.97 V, respectively. The metal ions which can liberate \({\mathrm{H}}_{2}\) from a dilute acid are

[JEE Main 2023, 29 Jan (Shift 1)]

The magnetic moment of a transition metal compound has been calculated to be \(3.87\) BM. The metal ion is

[JEE Main 2023, 24 Jan (Shift 1)]

The spin only magnetic moments (in \(BM\) ) for free \(Ti ^{3+}, V ^{2+}\) and \(Sc ^{3+}\) ions respectively are (At. No. Sc: 21; Ti: 22; V: 23)

[JEE Main 2021, 25 Jul (Shift 2)]

The atomic radius of Ag is closest to

The calculated spin only magnetic moment of \( \mathrm{Cr}^{2+} \) ion is:

[NEET 2020]

Identify the incorrect statement from the following:

[Re-NEET 2020]

Given below are two statements :
Statement (I) : The metallic radius of Al is less than that of Ga.
Statement (II) : The ionic radius of \({\mathrm{Al}}^{3+}\) is less than that of \({\mathrm{Ga}}^{3+}\).
In the light of the above statements, choose the most appropriate answer from the options given below :

What is the spin only magnetic moment value (BM) of divalent metal ion with atomic number 25 , in it's aqueous solution?

[JEE Main 2021, 17 Mar (Shift 1)]

The stability of \(\mathrm{Cu}^{2+}\) is more than \(\mathrm{Cu}^{+}\)salts in aqueous solution due to

[NEET 2023]

\(\mathrm{Zr}(\mathrm{Z}=40)\) and \(\mathrm{Hf}(\mathrm{Z}=72)\) have similar atomic and ionic radii because of

[NEET 2021]

Assertion (A): \(Cu ^{2+}\) in water is more stable than \(Cu ^{+}\).
Reason (R): Enthalpy of hydration for \(Cu ^{2+}\) is much less than that of \(Cu ^{+}\)

[JEE Main 2023, 1 Feb (Shift 2)]

Urea reacts with water to form \( A \) which will decompose to form \( B . B \) when passed through \( \mathrm{Cu}^{2+} \) (aq.), deep blue colour solution \( C \) is formed. What is the formula of \( C \) from the following?

[NEET 2020]

Given below are two statements:
Statement (I): A solution of \(\left[ Ni \left( H _2 O \right)_6\right]^{2+}\) is green in colour.
Statement (II): A solution of \(\left[ Ni ( CN )_4\right]^{2-}\) is colourless.
In the light of the above statements, choose the most appropriate answer from the options given below :

Identify the incorrect statement:

[NEET 2020]