Account for the following :
E° value for the Mn3+/Mn2+ couple is highly positive (+1.57 V) as compared to Cr3+/Cr2+.
Write one similarity and one difference between the chemistry of lanthanoid and actinoid elements.
How is the variability in oxidation states of transition metals different from that of the p-block elements?
An element has atomic mass 93 g mol–1 and density 11.5 g cm–3. If the edge
the length of its unit cell is 300 pm, identify the type of unit cell.
Calculate the number of unit cells in 8.1 g of aluminium if it crystallizes in a
f.c.c. structure. (Atomic mass of Al = 27 g mol–1)
Given
Mass of Al =8.1
Atomic mass of Al = 27 g mol-1
Number of atoms = Number of moles x 6.022 x1023
As one fcc unit has 4 atoms
Hence number of unit cells having 1.8066 x1023 atoms
Give reasons :
In stoichiometric defects, NaCl exhibits Schottky defect and not Frenkel
defect.