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Chemistry Question on d -and f -Block Elements

Which one of the following ionic species will impart colour to an aqueous solution ?

A

Ti4+Ti^{4+}

B

Cu+Cu^{+}

C

Zn2+Zn^{2+}

D

Cr3+Cr^{3+}

Answer

Cr3+Cr^{3+}

Explanation

Solution

Cr3+=1s2,2s22p6,3s23p63d3(coloured)Cr^{3+} =1s^2,2s^22p^6,3s^23p^63d^3 (coloured) (Cr3+(Cr^{3+} contains 3 unpaired e−,e^-, so it gives colour) Zn2+=1s2,2s22p6,3s23p63d10(colourless)Zn^{2+} =1s^2,2s^22p^6,3s^23p^63d^{10} (colourless) Cu+=1s2,2s22p6,3s23p63d10(colourless)Cu^{+} =1s^2,2s^22p^6,3s^23p^63d^{10} (colourless) Ti4+=1s2,2s22p6,3s23p6(colourless)Ti^{4+} =1s^2,2s^22p^6,3s^23p^6 (colourless) (Colour is produced due to presence of unpaired electrons.)