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Which gas is given out when metals react with dilute hydrochloric acid?
Chlorine
Nitrogen
Oxygen
Hydrogen
Hydrogen
When an active metal reacts with dilute hydrochloric acid (HCl), it undergoes a single displacement reaction to produce a metallic chloride salt and hydrogen gas. The metal displaces the hydrogen ion from the acid solution.
When an active metal reacts with dilute hydrochloric acid (HCl), it undergoes a single displacement reaction to produce a metallic chloride salt and hydrogen gas. The metal displaces the hydrogen ion from the acid solution.
Think of it like a stronger teammate (metal) taking the place of a weaker one (hydrogen) in a game, leaving the weaker one to go stand on the sidelines as a free gas.
MASH: Metal + Acid тЖТ Salt + Hydrogen
Zn+2HClтЖТZnCl2тАЛ+H2тАЛтЖС тАФ Reaction of Zinc with HCl
Mg+2HClтЖТMgCl2тАЛ+H2тАЛтЖС тАФ Reaction of Magnesium with HCl
The reactivity of metals determines the reaction. Metals that are higher than hydrogen in the electrochemical series can displace hydrogen from dilute acids. The general chemical equation is: 2M(s)+2nHCl(aq)тЖТ2MClnтАЛ(aq)+nH2тАЛ(g). For instance, zinc reacts as Zn(s)+2HCl(aq)тЖТZnCl2тАЛ(aq)+H2тАЛ(g).
The produced hydrogen gas can be tested using a burning splint, which produces a characteristic 'pop' sound.
Not all metals react with dilute acids (e.g., Copper and Silver do not react with dilute HCl because they are less reactive than hydrogen).
The reaction is typically exothermic.
Used in laboratories for the preparation of small amounts of hydrogen gas.
Not suitable for large-scale industrial hydrogen production due to cost and safety.
Laboratory gas generation.
Cleaning of metal surfaces by removing oxide layers.
The reaction rate depends on the reactivity of the metal. Magnesium reacts very vigorously, while Iron reacts slowly.
Chlorine, Nitrogen, and Oxygen are not displaced as gaseous products in this standard acid-metal displacement reaction.
D is correct тАФ When a metal reacts with dilute hydrochloric acid, it releases hydrogen gas.
Remember the reactivity series (K, Na, Ca, Mg, Al, Zn, Fe, Pb, H, Cu, Hg, Ag, Au); only metals above Hydrogen displace it from acids.
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