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By Expert Faculty of Sri Chaitanya
a
crystal of MgO is much harder than one of NaCl
b
Thermal stability of sulphates increases from Mg to Ba
c
Both (a) and (b) are correct
d
None of the above
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Correct option is C
Crystal structure depends on 1. ionic size 2 nature of cation and anion. 3. Charge on anion and cationhardness of ionic crystal depends on lattice energy,MgO has high Lattice energy than NaClstability of sulphates increases with electropositivity
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