Chapter 129 of 2363 min read

Transition elements: trends and properties

Why this is asked: Zn, Cd and Hg are d-block elements but not true transition elements — their d-subshell is completely filled (d¹⁰) in both the metal and its common ions, so they miss the defining traits: variable oxidation states, coloured ions, catalytic activity. Also, second- and third-row transition metals in the same group (Zr and Hf, for instance) have almost identical atomic radii, because lanthanoid contraction cancels out the increase you'd otherwise expect going down a group.

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Test yourself

•Match List I with List II.
List I List II
A. Haber process I. Fe catalyst
B. Wacker oxidation II. $PdC l_{2}$
C. Wilkinson catalyst III. $[(PP h_{3})_{3} RhCl]$
D. Ziegler catalyst IV. $TiC l_{4}$ with $Al (C H_{3})_{3}$
Choose the correct answer from the options given below:
•Given below are two statements: Statement I: Ferromagnetism is considered an extreme form of paramagnetism. Statement II: The number of unpaired electrons in a $C r^{2 +}$ ion ( $Z = 24$ ) is the same as that of an $N d^{3 +}$ ion ( $Z = 60$ ). In the light of the above statements, choose the correct answer from the options given below:
•The $E^{\circ}$ value for the $M n^{3 +} /M n^{2 +}$ couple is more positive than that of $C r^{3 +} /C r^{2 +}$ or $F e^{3 +} /F e^{2 +}$ due to the change of:

List I	List II
A. Haber process	I. Fe catalyst
B. Wacker oxidation	II. $PdC l_{2}$
C. Wilkinson catalyst	III. $[(PP h_{3})_{3} RhCl]$
D. Ziegler catalyst	IV. $TiC l_{4}$ with $Al (C H_{3})_{3}$

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