gas is released when iron filings react with hydrochloric acid.
A
Oxygen
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B
Chlorine
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C
Hydrogen
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Solution
The correct option is C Hydrogen Iron on reaction with hydrochloric acid, replaces the hydrogen from the acid and forms ferrous chloride. Hydrogen gas is evolved during the reaction in the form of bubbles. Fe(s)+2HCl(aq)→FeCl2(aq)+H2(g)