alleryStart learning →Which pair of metals reacts violently even with cold water?
Apotassium and sodium
Biron and zinc
Ccopper and silver
Daluminium and lead
Answer & Solution
Correct answer: A. potassium and sodium
1. Reactivity with water falls down the activity series.
2. **Potassium and sodium** react violently with cold water; the hydrogen released catches fire.
3. Iron/zinc react only with steam, and copper/silver do not react with water at all.
_Source: Karnataka SSLC (KSEEB) Class 10 Science, Ch3 'Metals and Non-metals', §3.2.2_
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