A metal which reacts with cold water vigorously producing hydrogen is a) Gold b) Tin c) Sodium d) Tungsten

Option c) Sodium. As we know, in the periodic table alkali metals are the most reactive metals. Sodium when in contact with cold water, readily reacts and an exothermic reaction takes place. 2Na(s)+2H2O(l)→2NaOH(aq)+H2(g)

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