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Which of the following metals is more reactive towards dilute hydrochloric acid?
This question was provided without multiple-choice options.
B
C
D
This question was provided without multiple-choice options.
Magnesium (Mg) is the most reactive metal among the given options towards dilute hydrochloric acid (HCl). Reactivity of metals with acids depends on their position in the reactivity series; metals situated higher up in the electrochemical series displace hydrogen more vigorously.
Magnesium (Mg) is the most reactive metal among the given options towards dilute hydrochloric acid (HCl). Reactivity of metals with acids depends on their position in the reactivity series; metals situated higher up in the electrochemical series displace hydrogen more vigorously.
Think of reactivity like enthusiasm: magnesium reacts explosively and fizzes furiously in acid like an overexcited crowd, whereas iron reacts sluggishly and takes much longer.
Please Send Cats, Monkeys And Cute Zebras In Lead Cages Safely: Potassium (K), Sodium (Na), Calcium (Ca), Magnesium (Mg), Aluminium (Al), Zinc (Zn), Iron (Fe), Lead (Pb), Copper (Cu), Silver (Ag).
Mg+2HClтЖТMgCl2тАЛ+H2тАЛ тАФ Reaction of Magnesium with Hydrochloric Acid
E┬░Mg2+/MgтАЛ=тИТ2.37┬аV тАФ Standard reduction potential indicating high reactivity
Metals that are more reactive than hydrogen react with dilute acids to evolve hydrogen gas and form metal salts. The reactivity of the given metals follows the electrochemical series order: Mg>Al>Zn>Fe. Magnesium lies above Aluminium, Zinc, and Iron, making it lose electrons most readily: Mg(s)+2HCl(aq)тЖТMgCl2тАЛ(aq)+H2тАЛ(g)
Reactivity series arranges metals in decreasing order of reactivity.
Magnesium (Mg) lies above Al, Zn, and Fe in the reactivity series.
Metals above hydrogen liberate H2тАЛ gas upon reaction with dilute acids.
Aluminium forms a passive oxide layer (Al2тАЛO3тАЛ) initially which slows down its initial reaction rate compared to magnesium.
High reaction rate produces hydrogen gas quickly.
Highly exothermic reactions with strong acids require careful handling.
Laboratory preparation of hydrogen gas.
Understanding metal displacement and electrochemical series.
Option B (Al) is less reactive than Mg due to smaller ionic size and protective oxide coating.
Option C (Zn) is moderately reactive.
Option D (Fe) is less reactive than Zn and Mg.
A is correct тАФ Magnesium (Mg) is placed higher in the reactivity series than Aluminium (Al), Zinc (Zn), and Iron (Fe), making it the most reactive towards dilute hydrochloric acid.
Always memorize the standard metal reactivity series (K, Na, Ca, Mg, Al, Zn, Fe, Pb, H, Cu, Hg, Ag, Au) as questions regarding displacement and acid reactions are frequently asked in RRB and SSC exams.
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