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NEET 2012
Exam
NEET
Year
2012
Subject
Chemistry
Chapter
d and f Block Elements

NEET 2012 · Chemistry · d and f Block Elements

Which one of the following does not correctly represent the correct...

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

Options

  1. ATi<V<Cr<Mn\mathrm{Ti} < \mathrm{V} < \mathrm{Cr} < \mathrm{Mn} : increasing number of oxidation states
  2. BTi3+<V3+<Cr3+<Mn3+\mathrm{Ti}^{3+} < \mathrm{V}^{3+} < \mathrm{Cr}^{3+} < \mathrm{Mn}^{3+} : increasing magnetic moment
  3. CTi<V<Cr<Mn\mathrm{Ti} < \mathrm{V} < \mathrm{Cr} < \mathrm{Mn} : increasing melting points
  4. DTi<V<Mn<Cr\mathrm{Ti} < \mathrm{V} < \mathrm{Mn} < \mathrm{Cr} : increasing second ionisation enthalpy

Correct answer

C. Ti<V<Cr<Mn\mathrm{Ti} < \mathrm{V} < \mathrm{Cr} < \mathrm{Mn} : increasing melting points

Step-by-step solution

Which one of the following does not correctly represent the correct order of the property indicated against it?
∴\therefore Order of oxidation states is Ti\mathrm{Ti}< V\mathrm{V} < Cr\mathrm{Cr} < Mn\mathrm{Mn} (b) ∵\because Magnetic moment, μ=n(n+2)\mu=\sqrt{n(n+2)} where, n=n= no. of unpaired electrons<imgsrc="/api/proxy−image?url=https∴<img src="/api/proxy-image?url=https%3A%2F%2Ffirebasestorage.googleapis.com%2Fv0%2Fb%2Fquantrexacademy-app.firebasestorage.app%2Fo%2Fquestions%252Ffigs%252Fpyq%252Fneet%252FDwaZsisMWqLt2Bz14ivkeHvwEVSIgCZPM25kokIvrrI.original.fullsize.png%3Falt%3Dmedia&clean=1&v=wm2" data-qx-orig-src="https://firebasestorage.googleapis.com/v0/b/quantrexacademy-app.firebasestorage.app/o/questions%2Ffigs%2Fpyq%2Fneet%2FDwaZsisMWqLt2Bz14ivkeHvwEVSIgCZPM25kokIvrrI.original.fullsize.png?alt=media" data-qx-storage-src="https://firebasestorage.googleapis.com/v0/b/quantrexacademy-app.firebasestorage.app/o/questions%2Ffigs%2Fpyq%2Fneet%2FDwaZsisMWqLt2Bz14ivkeHvwEVSIgCZPM25kokIvrrI.original.fullsize.png?alt=media"> \\ \therefore Order of magnetic moment is Ti3+\mathrm{Ti}^{3+} < V3+\mathrm{V}^{3+} < Cr3+\mathrm{Cr}^{3+} < Mn3+\mathrm{Mn}^{3+} (c) In 3 -series melting point increases as we move from left to right. But Mn shows low melting point due to its complex formating nature. It is unable to form metallic and covalent bonds. (d)<imgsrc="/api/proxy−image?url=https∴<img src="/api/proxy-image?url=https%3A%2F%2Ffirebasestorage.googleapis.com%2Fv0%2Fb%2Fquantrexacademy-app.firebasestorage.app%2Fo%2Fquestions%252Ffigs%252Fpyq%252Fneet%252FtzSfY_Zh9C_QdK5dIAiS2UwDqx_ceifcPNEGxgyZ3mE.original.fullsize.png%3Falt%3Dmedia&clean=1&v=wm2" data-qx-orig-src="https://firebasestorage.googleapis.com/v0/b/quantrexacademy-app.firebasestorage.app/o/questions%2Ffigs%2Fpyq%2Fneet%2FtzSfY_Zh9C_QdK5dIAiS2UwDqx_ceifcPNEGxgyZ3mE.original.fullsize.png?alt=media" data-qx-storage-src="https://firebasestorage.googleapis.com/v0/b/quantrexacademy-app.firebasestorage.app/o/questions%2Ffigs%2Fpyq%2Fneet%2FtzSfY_Zh9C_QdK5dIAiS2UwDqx_ceifcPNEGxgyZ3mE.original.fullsize.png?alt=media"> \\ \therefore Order of second ionisation enthalpy is Ti\mathrm{Ti}< V\mathrm{V}< Mn\mathrm{Mn}< Cr\mathrm{Cr}
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