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Q.

Alkali metals are so named because

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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
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