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Stoichiometry

"Zinc displac...

Question

"Zinc displaces $H_{2}$ on reaction with aqueous NaOH as well as with dilute HCl."
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Solution

Zinc displaces $H_{2}$ on reaction with aqueos NaOH as well as with HCl.
Zn can react with NaOH and HCl evolving $H_{2}$ gas.
$Z n + 2 H_{2} O + 2 N a O H \to N a_{2} [Z n (O H)_{4}] + H_{2}$
$Z n + 2 H C l \to Z n C l_{2} + H_{2}$

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