Chemistry
Grade-8
Easy
Question
When iron metal is taken in place of zinc for the laboratory preparation of Hydrogen, the volume of Hydrogen collected is lower. Identify the reason.
(i) Metal becomes passive due to the formation of a protective coating.
(ii) The formation of insoluble sulphate stops the further reaction.
(iii) There are impurities in the metal.
(iv) The reaction becomes reversible.
- Only (i) and (ii)
- Only (i) and (iii)
- Only (iii)
- Only (iv)
Hint:
The more the reaction moves forward the more the products are formed.
The correct answer is: Only (iv)
The correct option is d)(iv) The reaction becomes reversible.
Iron (Fe) is not used for hydrogen production in the laboratory because iron needs to be heated and produces impurities such as H2o and SO2 gases. It also reverses the reaction which results in low quantity of hydrogen.
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