Hydrogen mainly resembles alkali metals in the property

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Its I.P is similar to alkali metals

It has ${ns}^{2}$ configuration

It forms H+(aq) ion

It is electronegative

answer is A.

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Detailed Solution

Both hydrogen & alkali metals exhibit an electro positive character and are monovalent, i.e both have a tendency to lose the valence shell electron (loss in case of H and more in case of alkali metals) to form uni positive

ion (H+)

H→H++e−

1s1(1s1)

Li→Li++e−

(1s22s1)2s1

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