Which of the following gases is evolved when zinc granules react with aqueous solution of sodium hydroxide?
(1) O2
(2) CO2
(3) H2
(4) H2S
Answers
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Answer:
hydrogen gas
Sodium zincate and hydrogen gas are formed when zinc granules are treated with sodium hydroxide and water.
Explanation:
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When zinc granules react with an aqueous solution of sodium hydroxide hydrogen or H₂ gas is evolved (option 3).
- Zinc granules react with sodium hydroxide in the following way:
Zn + 2NaOH → Na₂ZnO₂(aq) + H₂(g)
Zinc Sodium Hydroxide Sodium zincate Hydrogen gas
- Because zinc granules displace hydrogen from sodium hydroxide, this chemical reaction is a single displacement reaction.
- A displacement reaction occurs when a more reactive element displaces a less reactive element from a solution, resulting in the formation of a salt.
- Hydrogen is displaced and released into the atmosphere as a gas.
- As a result of the reaction between zinc granules and sodium hydroxide, hydrogen gas is produced.
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