When ammonia is passed over heated $CuO$,it is oxidised to
- A$N_2$
- B$NO_2$
- C$N_2O$
- D$HNO_2$
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$P_4 + 3NaOH + 3H_2O \to A + 3NaH_2PO_2$. Here,$A$ is:
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$Pb(NO_3)_2 \xrightarrow{673 \ K} A + PbO + O_2$
$A \xrightarrow{\text{Dimerise}} B$
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In the Ostwald process for the manufacture of $HNO_3$,which of the following is used as a catalyst?
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