Iron filings react with ___________ to produce $H_{2}$ gas.

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Solution

When dilute Hydrochloric acid ( $HCl$ ) reacts with iron filings, Iron (II) chloride and Hydrogen gas is produced.
In this reaction, Iron displaces Hydrogen from Hydrochloric acid to form Iron chloride and Hydrogen gas.
The chemical reaction is as follows:
$Fe (s) + 2 HCl (dil) \to {FeCl}_{2} (aq) + H_{2} (g) ↑ (Iron filings) (Hydrochloric acid) (Iron chloride) (Hydrogen gas)$
Therefore, Iron filings react with dil. $HCl$ (Hydrochloric acid) to produce $H_{2}$ gas.

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