K, Ca, Na, Mg, Al, Zn, Fe, Pb, Cu, Ag. Name metal
(i) Which will displace hydrogen from cold water

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Solution

The reactivity series of metals,
Also known as the activity series, refers to the arrangement of metals in the descending order of their reactivities.
Therefore only K (Pottasium), Ca (Calcium), and Na (Sodium) displace the hydrogen from cold water.
Mg, Al, Zn, Fe, Pb, Cu, and Ag these does not react with water

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