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a
of their large atomic sizes
b
of their oxides give strong bases in water
c
of their high reactivity in air
d
of their colours imparted in bunsen flame
answer is B.
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Detailed Solution
IA group elements are called alkali metals, as alkali metals and their oxides dissoves in water gives strong bases which are alkaline in natureNa + H2O → NaOH + 1/2H2↑Na2O + H2O → 2NaOH