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(A) $1$. Melting point: The melting points of $3d$ transition elements do not follow a simple increasing trend. $Mn$ has an anomalously low melting po

Vedclass · Accepted Answer

$Ti < V < Cr < Mn$ - increasing melting point

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(A) $1$. Melting point: The melting points of $3d$ transition elements do not follow a simple increasing trend. $Mn$ has an anomalously low melting point due to its stable $d^5$ configuration,which leads to weak metallic bonding. Thus,the order $Ti $2$. $2^{nd}$ Ionization Enthalpy: The values generally increase across the period,but $Mn$ has a higher $2^{nd}$ ionization enthalpy than $Cr$ because $Cr^+$ has a $d^5$ configuration,making it relatively stable,while $Mn^+$ has a $d^5s^1$ configuration. The order $Ti $3$. Oxidation states: The number of oxidation states increases from $Ti$ to $Mn$ as the number of unpaired electrons increases. This is correct.$4$. Magnetic moment: Magnetic moment is given by $\mu = \sqrt{n(n+2)} \ BM$. For $Ti^{+3} (d^1, n=1)$,$V^{+3} (d^2, n=2)$,$Cr^{+3} (d^3, n=3)$,and $Mn^{+3} (d^4, n=4)$,the magnetic moment increases as $n$ increases. This is correct.Note: Both $A$ and $B$ are technically incorrect representations. However,in standard competitive chemistry contexts,the anomaly of $Mn$ in melting point is a primary focus.

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

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