(C) For $Ti, V, Cr, Mn$,the number of oxidation states are $3, 4, 5, 6$ respectively. Thus,$Ti < V < Cr < Mn$ is correct.For magnetic moment $(\mu) =

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$Ti < V < Cr < Mn$; increasing melting points

(C) For $Ti, V, Cr, Mn$,the number of oxidation states are $3, 4, 5, 6$ respectively. Thus,$Ti For magnetic moment $(\mu) = \sqrt{n(n+2)} \ B.M$:$Ti^{3+} (3d^1): n=1, \mu = \sqrt{3} \ B.M$$V^{3+} (3d^2): n=2, \mu = \sqrt{8} \ B.M$$Cr^{3+} (3d^3): n=3, \mu = \sqrt{15} \ B.M$$Mn^{3+} (3d^4): n=4, \mu = \sqrt{24} \ B.M$Thus,$Ti^{3+} The actual order of melting points is $Mn The $2^{nd}$ ionization enthalpy order is $Ti < V < Mn < Cr$,which is correct.

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

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

AIPMT 2012 All AIPMT

A
$Ti < V < Cr < Mn$; increasing number of oxidation states
B
$Ti^{3+} < V^{3+} < Cr^{3+} < Mn^{3+}$; increasing magnetic moment
C
$Ti < V < Cr < Mn$; increasing melting points
D
$Ti < V < Mn < Cr$; increasing $2^{nd}$ ionization enthalpy

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d-and f-Block Elements

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The magnetic moment of $M^{x+}$ (atomic number $= 25$) is $\sqrt{15} \ BM$. The number of unpaired electrons and the value of $x$,respectively,are

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Statement-$I$: Mercury is liquid at room temperature.
Statement-$II$: In mercury,there is no unpaired $d$-electron and thus,metallic bonding is weakest.

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For the four consecutive transition elements $Cr, Mn, Fe,$ and $Co$,the correct order of stability of their $+2$ oxidation state is:

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Most transition metals exhibit several characteristic properties. Which of the following statements are correct?
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$II$: Form coloured ions in solution.
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$IV$: Act as catalysts.

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The transition metal used in $X$-ray tubes is:

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

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The magnetic moment of $M^{x+}$ (atomic number $= 25$) is $\sqrt{15} \ BM$. The number of unpaired electrons and the value of $x$,respectively,are

Statement-$I$: Mercury is liquid at room temperature.Statement-$II$: In mercury,there is no unpaired $d$-electron and thus,metallic bonding is weakest.

For the four consecutive transition elements $Cr, Mn, Fe,$ and $Co$,the correct order of stability of their $+2$ oxidation state is:

Most transition metals exhibit several characteristic properties. Which of the following statements are correct?$I$: Form sets of compounds which display different oxidation states of the metal.$II$: Form coloured ions in solution.$III$: Burn vigorously in oxygen.$IV$: Act as catalysts.

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Statement-$I$: Mercury is liquid at room temperature.
Statement-$II$: In mercury,there is no unpaired $d$-electron and thus,metallic bonding is weakest.

Most transition metals exhibit several characteristic properties. Which of the following statements are correct?
$I$: Form sets of compounds which display different oxidation states of the metal.
$II$: Form coloured ions in solution.
$III$: Burn vigorously in oxygen.
$IV$: Act as catalysts.