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Question
State one relevant observation for the following:
Dry ammonia gas is passed over heated PbO.
Short Note
Solution
Yellow-coloured lead monoxide turns to grey-coloured lead metal when ammonia is passed over heated lead oxide.
\[\ce{3PbO + 2NH3 ->[Δ] 3Pb + 3H2O + N2}\]
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Dry Test - Recognition of Substances by Action of Heat
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