Q.
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a
B > Tl > In > Ga > Al...Electronegativity
b
BCl3 > AlCl3 > GaCl3 > InCl3... Lewis acid strength
c
PbO2 > SnO2> GeO2 > CO2.... Oxidizing Power
d
PbO2 > SnO2>SiO2 > CO2.... Acidic strength
answer is D.
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