What happened when
zinc granules are treated with dilute solution if H2SO4 and NaOH. Also write
the chemical equations if reaction occurs?
Answers
Hydrogen gas and zinc sulphate are formed when zinc granules are treated with sulphuric acid.
Zn + H2SO4 ⇨ ZnSO4 + H2
Zinc chloride and hydrogen gas are formed, when zinc granules are treated with hydrochloric acid.
2) Sodium zincate and hydrogen gas are formed when zinc granules are treated with sodium hydroxide and water.
Zn + 2H2O + 2NaOH ⇨ Na2Zn(OH)4 + H2
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Answer:
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Explanation:
(i) With dilute H2SO4 : H2 gas is evolved.
Zn + H2SO4 → ZnSO4 +H2 ↑
(ii) With dilute HCI : H2 gas is evolved.
Zn + HCl → ZnCl2 + H2 ↑
(iii) With dilute HNO3 : H2 gas is evolved.
Zn + 2HNO3 → Zn(NO3)2 + H2 ↑
(iv) With dilute NaCI :
No chemical reaction takes place, because Zn is less reactive than Na.
(v) With dilute NaOH :
Sodium zincate is formed and H2 gas is evolved. Zn + 2NaOH → Na2ZnO2 +H2 ↑
sodium zincate
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