(C) Lanthanoid contraction is the steady decrease in the atomic and ionic radii of lanthanoids with an increase in atomic number.Due to lanthanoid con

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$Zr$ and $Hf$ having similar radii.

(C) Lanthanoid contraction is the steady decrease in the atomic and ionic radii of lanthanoids with an increase in atomic number.Due to lanthanoid contraction,the elements of the $4d$ and $5d$ transition series,specifically $Zr$ $(Z=40)$ and $Hf$ $(Z=72)$,exhibit almost identical atomic and ionic radii.This similarity in size makes the separation of $Zr$ and $Hf$ very difficult.

Class 12 Chemistry The d- and f-Block Elements General Characteristics

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Lanthanoid contraction is responsible for which of the following?

A
$Zr$ and $Y$ having similar radii.
B
$Zr$ and $Nb$ having similar oxidation states.
C
$Zr$ and $Hf$ having similar radii.
D
$Zr$ and $Zn$ having similar oxidation states.

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The d- and f-Block Elements

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General Characteristics

Assertion: Cuprous ion $(Cu^{+})$ has unpaired electrons while cupric ion $(Cu^{2+})$ does not.
Reason: Cuprous ion $(Cu^{+})$ is colourless whereas cupric ion $(Cu^{2+})$ is blue in the aqueous solution.

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Which of the following ions is diamagnetic?

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$E^o$ for the conversion of $Ce^{+4}$ into $Ce^{+3}$ is $1.74 \ V$. It suggests that

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$A$ transition metal $M$ among $Sc, Ti, V, Cr, Mn$ and $Fe$ has the highest second ionisation enthalpy. The spin only magnetic moment value of $M^{+}$ ion is $. . . . . . . BM$ (Near integer)
(Given atomic number $Sc: 21, Ti: 22, V: 23, Cr: 24, Mn: 25, Fe: 26$)

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Which of the following is the heaviest metal?

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Lanthanoid contraction is responsible for which of the following?

Similar Questions

Assertion: Cuprous ion $(Cu^{+})$ has unpaired electrons while cupric ion $(Cu^{2+})$ does not.Reason: Cuprous ion $(Cu^{+})$ is colourless whereas cupric ion $(Cu^{2+})$ is blue in the aqueous solution.

Which of the following ions is diamagnetic?

$E^o$ for the conversion of $Ce^{+4}$ into $Ce^{+3}$ is $1.74 \ V$. It suggests that

$A$ transition metal $M$ among $Sc, Ti, V, Cr, Mn$ and $Fe$ has the highest second ionisation enthalpy. The spin only magnetic moment value of $M^{+}$ ion is $. . . . . . . BM$ (Near integer)(Given atomic number $Sc: 21, Ti: 22, V: 23, Cr: 24, Mn: 25, Fe: 26$)

Which of the following is the heaviest metal?

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Assertion: Cuprous ion $(Cu^{+})$ has unpaired electrons while cupric ion $(Cu^{2+})$ does not.
Reason: Cuprous ion $(Cu^{+})$ is colourless whereas cupric ion $(Cu^{2+})$ is blue in the aqueous solution.

$A$ transition metal $M$ among $Sc, Ti, V, Cr, Mn$ and $Fe$ has the highest second ionisation enthalpy. The spin only magnetic moment value of $M^{+}$ ion is $. . . . . . . BM$ (Near integer)
(Given atomic number $Sc: 21, Ti: 22, V: 23, Cr: 24, Mn: 25, Fe: 26$)