# The metal that gives hydrogen gas upon treatment with both acid as well as base is : Option 1) zinc Option 2) iron Option 3) mercury Option 4) magnesium

Oxidation states -

Transition elements have a variety of oxidation states but the common oxidation state is +2 for 3d metals.

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zinc is the metal that gives hydrogen gas on reacting with both acid & base

(i) $Zn+HCL\rightarrow ZnCL_{2}+H_{2}$

(ii) $Zn+2NaOH+2H_{2}O\rightarrow Na_{2}Zn(OH)_{4}+H_{2}$

$\therefore$Option (I) is correct

Option 1)

zinc

Option 2)

iron

Option 3)

mercury

Option 4)

magnesium

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