Latest questions in this category.
Tungsten (W) has the highest melting point among transition metals (3422°C).
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: Lanthanoids - Electronic Configuration and Lanthanoid Contraction
Interstitial compounds are formed when small atoms occupy voids in metal crystal lattices.
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: Lanthanoids - Electronic Configuration and Lanthanoid Contraction
Cu + is common due to the stability of the 3d 10 configuration.
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: Lanthanoids - Electronic Configuration and Lanthanoid Contraction
Lanthanoids are not highly volatile; they have high melting points.
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: Lanthanoids - Electronic Configuration and Lanthanoid Contraction
Cerium (Ce) exhibits +4 oxidation state due to the stability of empty 4f orbitals (4f 0 ).
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: Lanthanoids - Electronic Configuration and Lanthanoid Contraction
MnO 4 – oxidizes Fe 2+ to Fe 3+ and itself reduces to Mn 2+ .
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: Lanthanoids - Electronic Configuration and Lanthanoid Contraction
Lanthanoid contraction causes similar atomic radii of Zr (160 pm) and Hf (159 pm), making their separation difficult.
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: Lanthanoids - Electronic Configuration and Lanthanoid Contraction
Lanthanoid contraction causes similar atomic sizes of 4d and 5d transition elements.
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: Lanthanoids - Electronic Configuration and Lanthanoid Contraction
Lanthanoid contraction is the gradual decrease in atomic/ionic radii across the lanthanoid series.
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: Lanthanoids - Electronic Configuration and Lanthanoid Contraction
Yb 2+ has f 14 configuration which is stable due to completely filled f-orbitals.
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: Lanthanoids - Electronic Configuration and Lanthanoid Contraction
Let oxidation state of Cr be x. 2(+1) + 2x + 7(-2) = 0 → x = +6.
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: Lanthanoids - Electronic Configuration and Lanthanoid Contraction
Sc 3+ has no unpaired electrons (3d 0 ), so it does not exhibit d-d transitions.
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: Lanthanoids - Electronic Configuration and Lanthanoid Contraction
