When dilute hydrochloric acid is added to iron filings,

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iron hydride and chlorine gas are formed

no reaction takes place as hydrogen is more reactive than iron

iron displaces hydrogen from hydrochloric acid to form iron chloride

hydrochloric acid undergoes decomposition reaction

answer is A.

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Detailed Solution

When dilute hydrochloric acid is added to iron filings, iron being more reactive displaces hydrogen from dilute hydrochloric acid and forms iron (II) chloride along with the release of hydrogen gas.

$Fe (s) + 2 HCl (aq) \to {FeCl}_{2} (aq) + H_{2} (g)$

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