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Which of the following options represents metals that do NOT react with cold water?
Sodium, calcium and zinc
Sodium, iron and potassium
Sodium, calcium and potassium
Aluminium, iron and zinc
Aluminium, iron and zinc
Aluminium, iron, and zinc do NOT react with cold water or hot water. Instead, they react only with steam to form their respective metal oxides and hydrogen gas.
Aluminium, iron, and zinc do NOT react with cold water or hot water. Instead, they react only with steam to form their respective metal oxides and hydrogen gas.
Think of active vs. lazy workers: Sodium and potassium jump into action immediately upon touching cold water (like an enthusiastic worker starting a task instantly), whereas iron and aluminium are like cautious workers who refuse to work in the cold and only start working when things heat up significantly with steam.
Remember the middle-tier steam responders: 'Al-Fe-Zn steam clean!' (Aluminium, Iron, Zinc react with steam).
3Fe(s)+4H2тАЛO(g)тЖТFe3тАЛO4тАЛ(s)+4H2тАЛ(g) тАФ Reaction of iron with steam
2Al(s)+3H2тАЛO(g)тЖТAl2тАЛO3тАЛ(s)+3H2тАЛ(g) тАФ Reaction of aluminium with steam
The reactivity of metals with water depends on their position in the reactivity series. Highly reactive metals like potassium, sodium, and calcium react vigorously with cold water. Moderately reactive metals like magnesium, aluminium, zinc, and iron lie in the middle of the reactivity series and form a protective oxide layer or require higher thermal energy (steam) to react, as they are not reactive enough to displace hydrogen from cold water.
Potassium (K) and sodium (Na) react violently with cold water.
Calcium (Ca) reacts less violently with cold water; the metal floats because hydrogen bubbles stick to its surface.
Aluminium (Al), zinc (Zn), and iron (Fe) do not react with cold or hot water, but react with steam.
Copper, silver, gold, and lead do not react with water under any normal conditions.
Understanding metal reactivity is vital for metallurgy and corrosion prevention.
Storage of reactive metals like sodium under kerosene oil.
Option A (Sodium, calcium and zinc): Sodium reacts with cold water, making this option incorrect.
Option B & C (Sodium, iron and potassium): Sodium and potassium react vigorously with cold water.
Option D (Aluminium, iron and zinc): None of these react with cold water, making it the correct choice.
D is correct тАФ Aluminium, iron, and zinc do not react with cold or hot water; they only react with steam to form metal oxides and hydrogen gas.
Always memorize the metal reactivity series in decreasing order (K > Na > Ca > Mg > Al > Zn > Fe > Pb > H > Cu > Hg > Ag > Au)
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