This category explores the oxidation states, colour, and magnetic properties of d-block elements. It provides insights into their behavior and characteristics, useful for chemistry exam preparation.
Cr 2 O 7 2– oxidizes H 2 S to S (yellow precipitate) and reduces to Cr 3+ (green).
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: Oxidation States and Colour and Magnetic Properties of d-Block
Using the spin-only formula: μ = √[n(n+2)] = √[3(3+2)] = √15 ≈ 3.87 BM
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: Oxidation States and Colour and Magnetic Properties of d-Block
Cu + is common due to the stability of the 3d 10 configuration, though it disproportionates in aqueous solution.
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: Oxidation States and Colour and Magnetic Properties of d-Block
Transition metals have voids in their crystal lattices that can accommodate small atoms like H, C, or N.
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: Oxidation States and Colour and Magnetic Properties of d-Block
+3 is the predominant oxidation state for lanthanoids due to the stability of Ln 3+ ions.
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: Oxidation States and Colour and Magnetic Properties of d-Block
Variable oxidation states allow transition metals to form unstable intermediates.
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: Oxidation States and Colour and Magnetic Properties of d-Block
The hexacyanoferrate(II) ion has octahedral geometry with d 2 sp 3 hybridization.
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: Oxidation States and Colour and Magnetic Properties of d-Block
All lanthanoids show the +3 oxidation state, though some may also exhibit +2 or +4 states.
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: Oxidation States and Colour and Magnetic Properties of d-Block
Mn 2+ has 5 unpaired electrons (3d 5 ), giving the highest magnetic moment (5.92 BM).
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: Oxidation States and Colour and Magnetic Properties of d-Block
Europium (Eu) shows +2 oxidation state due to the stability of half-filled 4f 7 configuration, along with the common +3 state.
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: Oxidation States and Colour and Magnetic Properties of d-Block
Transition metals typically have high melting points due to strong metallic bonding.
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: Oxidation States and Colour and Magnetic Properties of d-Block
Transition elements typically have high melting points due to strong metallic bonding involving d-electrons, so low melting points is not a characteristic property.
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: Oxidation States and Colour and Magnetic Properties of d-Block
