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Which gas is released when metal reacts with an acid?
Oxygen
Carbon dioxide
Hydrogen
Nitrogen
Hydrogen
When reactive metals react with dilute mineral acids, hydrogen gas is displaced and evolved. Option C is the correct answer because active metals reduce hydrogen ions from the acid.
When reactive metals react with dilute mineral acids, hydrogen gas is displaced and evolved. Option C is the correct answer because active metals reduce hydrogen ions from the acid.
Dropping a zinc piece into hydrochloric acid producing fizzing gas bubbles is like a chemical partner-swap releasing trapped hydrogen gas.
MA-SH: Metal + Acid тЖТ Salt + Hydrogen
Metal+AcidтЖТMetal┬аSalt+H2тАЛтЖС тАФ General word equation
Zn+2HClтЖТZnCl2тАЛ+H2тАЛтЖС тАФ Zinc reaction
Active metals such as Zn, Fe, and Mg undergo single displacement reactions with dilute acids like HCl or H2тАЛSO4тАЛ. Metal atoms lose electrons to form metal cations while H+ ions gain electrons to form H2тАЛ gas.
Only metals lying above hydrogen in the electrochemical reactivity series evolve H2тАЛ with dilute acids.
Concentrated or dilute HNO3тАЛ typically yields nitrogen oxides instead of hydrogen due to its oxidizing property.
Laboratory preparation of H2тАЛ gas
Qualitative identification of active metals
Standard test for H2тАЛ gas: burns with a pop sound.
Option A, B, and D are gases not produced by standard metal-acid single displacement.
C is correct тАФ Hydrogen gas is released during the single displacement reaction of active metals with dilute acids.
Watch out for HNO3тАЛ traps in exams; it rarely gives H2тАЛ gas unless with Mg or Mn at very high dilutions.
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