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`NO_(2)` can be obtained by heating

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`NO_(2)` can be obtained by heating
A. `KNO_(3)`
B. `Pb(NO_(3))_(2)`
C. `Cu(NO_(3))_(2)`
D. Cu + conc `HNO_(3)`
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Correct Answer - B::C::D
`KNO_(3) overset(Delta)rarr KNO_(2)+O_(2)`
`Pb (NO_(3))_(2) overset(Delta)rarr PbO +NO_(2) +O_(2)`
`Cu (NO_(3))_(2) overset(Delta)rarr CuO +NO_(2) +O_(2)`
`Cu +"conc" HNO_(3) rarr NO_(2)+Cu (NO_(3))_(2) +H_(2)O`
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