(A) $I$. $V^{2+}$ is violet,$Cr^{3+}$ is violet,and $Mn^{3+}$ is violet. All three ions exhibit a violet colour in aqueous solution.$II$. $Zn^{2+}$ is

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(A) $I$. $V^{2+}$ is violet,$Cr^{3+}$ is violet,and $Mn^{3+}$ is violet. All three ions exhibit a violet colour in aqueous solution.$II$. $Zn^{2+}$ is colourless,$V^{3+}$ is green,and $Fe^{3+}$ is yellow.$III$. $Ti^{4+}$ is colourless,$V^{4+}$ is blue,and $Mn^{2+}$ is pink.$IV$. $Sc^{3+}$ is colourless,$Ti^{3+}$ is purple,and $Cr^{2+}$ is blue.Therefore,the set with the same colour is $V^{2+}, Cr^{3+}, Mn^{3+}$.

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

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The correct set of ions (aqueous solution) with the same colour from the following is:

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A
$V^{2+}, Cr^{3+}, Mn^{3+}$
B
$Zn^{2+}, V^{3+}, Fe^{3+}$
C
$Ti^{4+}, V^{4+}, Mn^{2+}$
D
$Sc^{3+}, Ti^{3+}, Cr^{2+}$

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d-and f-Block Elements

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General Characteristics

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Transition elements act as catalysts because....

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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.

Column-$I$ Column-$II$

$(a) \ Co^{3+}$ $(i) \ \sqrt{8} \ B.M.$

$(b) \ Cr^{3+}$ $(ii) \ \sqrt{35} \ B.M.$

$(c) \ Fe^{3+}$ $(iii) \ \sqrt{3} \ B.M.$

$(d) \ Ni^{2+}$ $(iv) \ \sqrt{24} \ B.M.$

$(v) \ \sqrt{15} \ B.M.$

$(a) \quad (b) \quad (c) \quad (d)$

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The number of unpaired electrons in $Mn^{2+}$ ion is

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Assertion $(A)$: While going from left to right in the periodic table,the atomic size decreases more rapidly for the $3d$-series compared to the $4f$-series of elements.
Reason $(R)$: $3d$-electrons experience lesser shielding than $4f$-electrons.

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In the ground state of cobalt atom $(Z = 27)$ there are $.......$ unpaired electrons and thus the atom is $.......$

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Column-$I$	Column-$II$
$(a) \ Co^{3+}$	$(i) \ \sqrt{8} \ B.M.$
$(b) \ Cr^{3+}$	$(ii) \ \sqrt{35} \ B.M.$
$(c) \ Fe^{3+}$	$(iii) \ \sqrt{3} \ B.M.$
$(d) \ Ni^{2+}$	$(iv) \ \sqrt{24} \ B.M.$
	$(v) \ \sqrt{15} \ B.M.$

The correct set of ions (aqueous solution) with the same colour from the following is:

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Transition elements act as catalysts because....

The number of unpaired electrons in $Mn^{2+}$ ion is

Assertion $(A)$: While going from left to right in the periodic table,the atomic size decreases more rapidly for the $3d$-series compared to the $4f$-series of elements.Reason $(R)$: $3d$-electrons experience lesser shielding than $4f$-electrons.

In the ground state of cobalt atom $(Z = 27)$ there are $.......$ unpaired electrons and thus the atom is $.......$

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Assertion $(A)$: While going from left to right in the periodic table,the atomic size decreases more rapidly for the $3d$-series compared to the $4f$-series of elements.
Reason $(R)$: $3d$-electrons experience lesser shielding than $4f$-electrons.