Question

<!--td {border: 1px solid #cccccc;}br {mso-data-placement:same-cell;}--> Why granulated zinc is preferred for the laboratory preparation of hydrogen? [2 Mark]

Answer 1

<!--td {border: 1px solid #cccccc;}br {mso-data-placement:same-cell;}--> Granulated zinc contains copper as an impurity, which acts as a positive catalyst for the reaction to produce hydrogen. So, granulated zinc is preferred over pure zinc for the laboratory preparation of hydrogen. [2 Mark]