Question

What happens when zinc granules are treated with dilute solution of H2SO4 , HCl, HNO3 , NaCl and NaOH, also write the chemical
equations if reaction occurs

NCERT Class X
Science - Exemplar Problems

Chapter_Chemical Reactions And Equations

Answer 1

Metal +Acid= Salt + Hydrogen
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When zinc granules are treated with dilute solution of H2SO4 , we get Zinc Sulphate and H2 gas
Zn + H2SO4 ---> ZnSO4 +H2
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When zinc granules are treated with dil.HCl, we get Zinc chloride and H2 gas
Zn +2 HCL- ---> ZnCl2 + H2
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Zinc reacts with dil.nitric acid to produce zinc nitrate and Hydrogen
Zn +2 HNO3 -----> Zn(NO3)2 + H2
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Zn + NaCl ---> No reaction.
As Zinc is less reactive than sodium.Hence it cannot replace sodium from its salt.
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Base + Metal ----> Salt + Hydrogen.
Zinc reacts with sodium hydroxide and forms sodium zincate and Hydrogen.
2NaOH + Zn -----> Na2ZnO2 + H2
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Answer 2

Metal +Acid= Salt + Hydrogen

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When zinc granules are treated with dilute solution of H2SO4 , we get Zinc Sulphate and H2 gas

Zn + H2SO4 ---> ZnSO4 +H2

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When zinc granules are treated with dil.HCl, we get Zinc chloride and H2 gas

Zn +2 HCL- ---> ZnCl2 + H2

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Zinc reacts with dil.nitric acid to produce zinc nitrate and Hydrogen

Zn +2 HNO3 -----> Zn(NO3)2 + H2

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Zn + NaCl ---> No reaction.

As Zinc is less reactive than sodium.Hence it cannot replace sodium from its salt.

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Base + Metal ----> Salt + Hydrogen.

Zinc reacts with sodium hydroxide and forms sodium zincate and Hydrogen.

2NaOH + Zn -----> Na2ZnO2 + H2

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