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Question

When zinc reacts with sodium hydroxide, the products formed are


A

zinc hydroxide and sodium

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B

sodium zincate and water

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C

sodium zincate and hydrogen gas

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D

sodium zincate and oxygen.

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Solution

The correct option is D

sodium zincate and oxygen.


The explanation for the correct option (C):

  • The reaction between metal and a base results in salt formation and the evolution of Hydrogen gas (H2). Zinc (Zn) is a metal and Sodium hydroxide (NaOH) is a base.
  • When Zn metal is added to NaOH, it results in the formation of Sodium zincate (Na2ZnO2) salt along with Hydrogen gas. The reaction between Zinc and Sodium hydroxide is:

Zn(s)+2NaOH(aq)Na2ZnO2(aq)+H2(g)

Final Answer: Hence, option (C) is correct. When Zinc reacts with Sodium hydroxide, the products formed are Sodium zincate and Hydrogen gas.


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