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Question
Give a reason why metals are arranged in a series called – ‘activity series of metals’. Name a metal which reacts with
(a) Cold water
(b) Boiling water
(c) Steam to liberate hydrogen in each case.
Solution
Metals arranged in series are called ‘activity series of metals’ because metals differ in tendency to lose valence electrons and can be arranged in a series, i.e. metals are arranged in decreasing order of their reactivity. The most reactive metal at top of the series and then with decreasing reactivity.
Metal that reacts with
(a) Cold water – Sodium
2Na + 2H2O → 2NaOH + H2
(b) Boiling water – Magnesium [Mg]
(c) Steam – Iron [Fe]
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