Zinc oxide was added to dilute HCl and zinc oxide was added to dilute NaOH.Explain the difference?

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Solution

Since $Z n$ is an amphoteric oxide . it can react with both acid and base.

$Z n O +$ dil $H C l \to Z n C l_{2} + H_{2} O$

$Z n O + N a O H \to N a_{2} Z n O_{2}$

Hence the products in both cases are different.

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When a student added Zinc granules to dilute $H C l$ , a colourless and odourless gas was evolved, which was tested with a burning match stick, it was observed that:

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Zinc oxide was added to dilute HCl and zinc oxide was added to dilute NaOH.Explain the difference?

Since Zn is an amphoteric oxide . it can react with both acid and base. ZnO+ dil HCl→ZnCl2+H2O ZnO+NaOH→Na2ZnO2 Hence the products in both cases are different.

Since $Z n$ is an amphoteric oxide . it can react with both acid and base.

$Z n O +$ dil $H C l \to Z n C l_{2} + H_{2} O$

$Z n O + N a O H \to N a_{2} Z n O_{2}$

Hence the products in both cases are different.