InterviewSolution
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InterviewSolution
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`NO_(2)`,a red -brown poisonous gas is prepared in the laboratory by heatingA. `NaNO_(3)`B. `NH_(4)NO_(3)`C. `Pb(NO_(3))_(2)`D. `KNO_(3)` |
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Answer» Correct Answer - 3 Nitrogen dioxde is prepared in the laboratory either by heating nitrates of heavy metals `2Pb(NO_(3))_(2)overset(Delta)rarr2PbO+4NO_(2)+O2` `Cu(NO_(3))_(2)(s)overset(Delta)rarrCuO(s)+2NO_(2)(g)+(1)/(2)O_(2)(g)` or by action of concentrated nitric acid on metals like copper, silve, lead etc `Cu+4NHO_(3)rarrCu(NO_(3))_(2)+2NO_(2)+2H_(2)O` In the previous case the mixture of nitrogen dioxide and oxygen is passed through a U- table cooled by freezing mixture. `NO_(2)` condenses to a pale yellow liquid while oxygen escapes. `NO_(2)` is produced on a large scale by oxidizing `NO` in the Ostwald process for the manufacture of nitric acid. `NH_(4)NO_(3) overset(Delta)rarr N_(2)O+2H_(2)O` `MNO_(3)rarrMNO_(2)+O_(2)` `(M=Na, K" etc")` `LiNO_(3)rarr Li_(2)O+NO_(2)+O_(2)` |
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