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Which gas is evolved when dilute hydrochloric acid reacts with zinc granules?
Chlorine
Oxygen
Hydrogen
Nitrogen
Hydrogen
When dilute hydrochloric acid reacts with zinc granules, a single displacement reaction occurs. Zinc is more reactive than hydrogen, allowing it to displace hydrogen ions from the acid to form zinc chloride and evolve hydrogen gas.
When dilute hydrochloric acid reacts with zinc granules, a single displacement reaction occurs. Zinc is more reactive than hydrogen, allowing it to displace hydrogen ions from the acid to form zinc chloride and evolve hydrogen gas.
Zinc cuts in and breaks up the hydrogen-chlorine pair because it's more reactive/dominant, leaving hydrogen free to float away.
ACID + METAL тЖТ SALT + H2тАЛ ('A-M-S-H')
Zn(s)+2HCl(aq)тЖТZnCl2тАЛ(aq)+H2тАЛ(g) тАФ Single displacement reaction
Zinc undergoes oxidation by losing electrons (Zn тЖТ Zn2++2eтИТ), while hydrogen ions from HCl undergo reduction by gaining electrons (2H++2eтИТтЖТ H_2$$\uparrow). The net result is the liberation of hydrogen gas bubbles from the metal surface.
Zinc lies above hydrogen in the metal reactivity series.
Evolution of hydrogen gas is confirmed by a characteristic 'pop' sound when brought near a burning splinter.
The reaction is exothermic.
Simple, standard laboratory method for small-scale hydrogen gas generation
Pure zinc reacts slowly; traces of copper sulfate are sometimes added to catalyze the rate via galvanic cell formation
Laboratory preparation of hydrogen gas
Demonstration of single-displacement and metal-acid reactivity in CBT exams
Nitric acid (HNO3тАЛ) is a strong oxidizing agent and typically yields nitrogen oxides instead of H2тАЛ gas with active metals.
Options A, B, and D do not represent reduction displacement products of standard active metals with dilute non-oxidizing acids.
C is correct тАФ Dilute hydrochloric acid reacts with zinc granules to evolve hydrogen gas.
Watch out for oxidizing acids like HNO3тАЛ; they rarely release H2тАЛ gas with metals due to immediate oxidation of H2тАЛ to H2тАЛO.
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