The nitrogen containing compound produced in the reaction of HNO3 with P4O10
P4O10 + HNO3 → H3PO4 + N2O5
P4 + HNO3 → H3PO4 + NO2 + H2O
(D) Na + N2O5 → NaNO3 + NO2
(B) N2O5 is diamagnetic
The reaction between concentrated nitric acid (HNO3) and phosphorus pentoxide (P4O10) produces nitronium nitrate (N2O5), which is the anhydride of nitric acid. The balanced chemical equation is:
N2O5 is dinitrogen pentoxide. Let's analyze the given statements about this compound:
Statement 1: Contains one N–N bond
This is incorrect. The structure of N2O5 is (nitronium nitrate). It contains an N-O-N bond, not an N-N bond.
Statement 2: Reacts with Na metal producing a brown gas
This is correct. N2O5 is a strong oxidizing agent. When it reacts with sodium metal (a strong reducing agent), it is reduced, producing nitrogen dioxide (NO2), which is a brown gas. The reaction can be represented as:
Statement 3: Is diamagnetic
This is correct. Diamagnetic substances are repelled by a magnetic field. This occurs when all electrons in a substance are paired. In N2O5, all electrons are paired in their respective orbitals, making the molecule diamagnetic.
Statement 4: Can also be prepared by reaction of P4 and HNO3
This is incorrect. White phosphorus (P4) reacts with concentrated nitric acid to produce orthophosphoric acid (H3PO4) and nitrogen oxides (like NO2), not N2O5. The reaction is:
Summary of correct statements: The nitrogen-containing compound (N2O5) reacts with Na metal producing a brown gas (NO2) and is diamagnetic.
Key Concept: The reaction between P4O10 and HNO3 is a method for preparing the anhydride of an acid (N2O5 is the anhydride of HNO3).
Oxidation-Reduction: N2O5 acting as an oxidizing agent with sodium metal follows standard redox principles, where the oxidant (N25) is reduced and the reductant (Na) is oxidized.
Magnetic Properties: Diamagnetism is a property where a substance has no unpaired electrons and is weakly repelled by a magnetic field.