metal gas with acid? magnesium yes iron yes copper none The ladder shows metals with hydrogen marked. The table shows gas produced with dilute acid. Using b...
Question 1 Report
| metal | gas with acid? |
|---|---|
| magnesium | yes |
| iron | yes |
| copper | none |
The ladder shows metals with hydrogen marked. The table shows gas produced with dilute acid. Using both, which metal is placed just below hydrogen, giving no gas with acid?
Answer Details
A metal releases hydrogen from dilute acid only if it is above hydrogen in the reactivity series, because it must be able to give electrons to \(\text{H}^{+}\) ions. Magnesium and iron both bubble, confirming they lie above hydrogen: \[\text{Fe} + 2\text{HCl} \rightarrow \text{FeCl}_2 + \text{H}_2\]
The table shows no gas at all with copper, so copper cannot reduce hydrogen ions and must sit just below hydrogen on the ladder, exactly where the diagram places it.
A frequent error is to choose hydrogen itself. Hydrogen is placed in the series purely as a reference marker for acid reactions; it is not one of the metals being tested. Use the "no gas with dilute acid" result as the standard evidence that a metal is below hydrogen.
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