NEET Chemistry Hydrogen Questions Solved

Hydrogen is not obtained when zinc reacts with:

(a) cold water

(b) dil. H2SO4

(c) dil HCl

(d) hot 20% NaOH

(a) Elements having reduction potential of -0.41V or below can liberate hydrogen from cold water. Such as alkali metals Ba, Sr and Ca.

Also Zn-Cu and Al-Hg couples liberate hydrogen with cold water.

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