21. Write a balanced chemical equation for each:
(a) Lead reacts with oxygen to give oxide of lead.
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The surface of metallic lead is protected by a thin layer of lead oxide, PbO. Only upon heating lead to 600-800°C does lead react with oxygen in air to from lead oxide, PbO.
2Pb(s) + O2(g) → 2PbO(s)
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Lead reacts with oxygen to give oxide of lead.
Explanation:
Lead is a reactive metal
Due to its reactivity, it easily comes in contact with oxygen present in the atmosphere and forms lead oxide
When a freshly cut piece of lead comes in contact with air it forms a thin layer of lead oxide
Balanced equation is
2 Pb + O₂ → 2PbO (Lead Oxide)
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