Question:
When zinc metal is reacted with aqueous sodium hydroxide, the products formed are
When zinc metal is reacted with aqueous sodium hydroxide, the products formed are
Updated On: Apr 4, 2025
- zinc hydroxide and oxygen only
- sodium zincate and oxygen only
sodium zincate and hydrogen oxide only
- sodium zincate and hydrogen only
sodium zincate, hydrogen and oxygen
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The Correct Option is C
Solution and Explanation
When zinc metal is reacted with aqueous sodium hydroxide, the products formed are:
- zinc hydroxide and oxygen only
- sodium zincate and oxygen only
- sodium zincate, hydrogen and oxygen
- sodium zincate and hydrogen only
- sodium zincate and hydrogen oxide only
Correct Answer: sodium zincate and hydrogen only
Explanation:
The reaction of zinc metal with aqueous sodium hydroxide is as follows:
Zn(s) + 2NaOH(aq) + 2H2O(l) → Na2ZnO2(aq) + 3H2(g)
- Na2ZnO2 is sodium zincate (soluble complex).
- H2 is evolved as hydrogen gas.
This is an example of an amphoteric metal (Zn) reacting with a strong base (NaOH).
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