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Question

Hydrogen is placed in group - I as it shows similarities in properties with alkali metals (Li, Na, K, etc.). Identify such similar properties between Hydrogen (H) and Alkali metals (M).

A
Both form unipositive ion (H+ and M+ ion).
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B
Both can combine with halogens to form halides (HX and MX).
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C
Both have a valency of 1 (one).
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D
All of the above.
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Solution

The correct option is D All of the above.
The element hydrogen (H) can form hydrogen halides meaning, it can form H+ ions in HF, HCl, HBr, etc. It resembles group - I elements, Li, Na, K, etc. as they form Li+,Na+,K+, etc. in metal halides (LiCl, NaCl, KBr, etc.). So, it can be placed in group - I along with Li, Na, K. Both hydrogen and other alkali metals have only one electron in their outermost shell (valence shell). So, their valency is 1 (one).

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