d and f Block Elements

The lanthanide ion having four unpaired electrons is (Given : Atomic numbers of $\mathrm{Ce}=58, \mathrm{Nd}=60, \mathrm{~Tb}=65$ and $\mathrm{Ho}=67$ )

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: Generally, $3 d$ transition metals have high melting points.
Reason R: Involvement of $3 d$-electrons in addition to $4 s$-el...

The green paramagnetic species formed by heating $\mathrm{KMnO}_4$ at 513 K is

The calculated 'spin-only' magnetic moment $\mathrm{Ti}^{2+}\left(3 \mathrm{~d}^2\right)$ is :

Although +3 oxidation state is most common in lanthanoids, cerium still shows +4 oxidation state because:

\(\text { Match List I with List II : }\)


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Given below are two statements :
Statement I: Ferromagnetism is considered as an extreme form of paramagnetism.
Statement II : The number of unpaired electrons in a $\mathrm{Cr}^{2+}$ ion $(\mathrm{Z}=24)$ is the same as that of a $\mathrm{...

Match List - I with List - II.

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Identify the incorrect statement.

Match List I with List II:

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The UV-visible absorption bands in the spectra of lanthanoid ions are 'X', probably because of the excitation of electrons involving 'Y'. The 'X' and 'Y', respectively, are :
Narrow and d and f orbitals

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

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

Baeyer's reagent is :

The pair of lanthanoid ions which are diamagnetic is

The \(\mathrm{E}^{\circ}\) value for the \(\mathrm{Mn}^{3+} / \mathrm{Mn}^{2+}\) couple is more positive than that of \(\mathrm{Cr}^{3+} / \mathrm{Cr}^{2+}\) or \(\mathrm{Fe}^{3+} / \mathrm{Fe}^{2+}\) due to change of

'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 are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : Ionisation enthalpies of early actinoids are lower than for early lanthanoids.
Reason (R) : Electrons are entering 5f...

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : Ionisation enthalpy increases along each series of the transition elements from left to right. However, small variati...

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 $$\mat...

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

Given below are two statements :
Statement I : Cr2+ is oxidising and Mn3+ is reducing in nature.
Statement II : Sc3+ compounds are repelled by the applied magnetic field.
In the light of the above statements, choose the most appropriate ans...

Zr (Z = 40) and Hf (Z = 72) have similar atomic and ionic radii because of :

Which of the following reactions is the metal displacement reaction? Choose the right option.

The incorrect statement among the following is :

Identify the incorrect statement.

Match the metal ions given in Column I with
the spin magnetic moments of the ions given
in Column II and assign the correct code :

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Which one of the following ions exhibits d-d
transition and paramagnetism as well?

The reason for greater range of oxidation states in actinoids is attributed to

HgCl2 and I2 both when dissolved in water containing I\(-\) ions, the pair of species formed is

Name the gas that can readily decolourise acidified KMnO4 solution.

Which one of the following statements related to lanthanoids is incorrect?

Which one of the following statements is correct when SO2 is passed through acidified K2Cr2O7 solution?

The electronic configuration of Eu (Atomic No. 63), Gd (Atomic No. 64) and Tb (Atomic No.65) are

Because of lanthanoid contraction, which of the following pairs of elements have nearly same atomic radii? (Numbers in the parenthesis are atomic numbers)

Magnetic moment 2.84 B.M. is given by (At. nos. Ni = 28, Ti = 22, Cr = 24, Co = 27)

Which of the following processes does not involve oxidation of iron?

Assuming complete ionisation, same moles of which of the following compounds will require the least amount of acidified KMnO4 for complete oxidation?

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

Reason of lanthanoid contraction is

Magnetic moment 2.83 BM is given by which of the following ions?
(At. nos. Ti = 22, Cr = 24, Mn = 25, Ni = 28)

The reaction of aqueous KMnO4 with H2O2 in acidic conditions gives

Sc (Z = 21) is a transition element but Zn (Z = 30) is not because

Which of the following statements about the interstitial compounds is incorrect?

Which of the following lanthanoid ions is diamagnetic?
(At. nos. Ce = 58, Sm = 62, Eu = 63, Yb = 70)

Identify the alloy containing a non-metal as a constituent in it.

Which of the statements is not true?

Four successive members of the first series of the transition metals are listed below. For which one of them the standard potential \(\left( {E_{{M^{2 + }}/M}^o} \right)\) value has a positive sign?

Which one of the following does not correctly represent the correct order of the property indicated against it?

The catalytic activity of transition metals and their compounds is ascribed mainly to