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Chemistry

Elements which show unique nature in the preparation of hydrogen are

  1. Na, K, Li
  2. Mg, Ca, Ba
  3. Al, Zn, Pb
  4. Fe, Cu, Ag

Hydrogen

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Answer

Al, Zn, Pb

Reason ā€” Metals like zinc, aluminium and lead are considered to have a unique nature in the preparation of hydrogen. They react with acids and can even react with hot concentrated alkalis to form hydrogen and a soluble salt.

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