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State one relevant observation for the ...

State one relevant observation for the reaction
Action of concentrated nitric acid on copper.

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Action of concentrated nitric acid on copper Reddish brown fumes of `NO_(2)` are produced when copper reacts with conc. nitric acid :
`Cu(s)+4HNO_(3) to Cu(NO_(3))_(2)+2H_(2)O+2NO_(2)`
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ICSE-SAMPLE PAPER 2020-SECTION-II (40 Marks) Attempt any four questions from this Section
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