(a) What is the role of phosphorous pentoxide in the preparation of `N – InterviewSolution

InterviewSolution

1.	(a) What is the role of phosphorous pentoxide in the preparation of `N_2 O_5` ? (b) Phosphine is prepared in an inert atmosphere of `CO_2`. Why ? ( c) Red phosphorous is used for making matches. Why ?
Answer» (a) `P_4O_10` acts as strong dehydrating agent. It removes water molecules from nitric acid, `HNO_3` to form `N_2 O_5`. `P_4 O_10 + 12 HNO_3 rarr 4 H_3 PO_4 + 6 N_2 O_5`. (b) Phosphine, being inflammable, burns in air. It is therefore prepared in an inert atmosphere. ( c) Red phosphorous is non-poisonous and has a high ignition point and hence red phosphorous is used for making matches.

Discussion

No Comment Found

Related InterviewSolutions

Nitric oxide, though an odd electron molecule, is diamagenetic in liquid state.
In the reaction: `3Br_(2)+6OH^(Theta)rarr 5Br^(Theta)+BrO_(3)^(Theta)+3H_(2)O,Br_(2)` isA. OxidisedB. ReducedC. DisintegratedD. Disproportionted
Give balanced equations for the following : Phosphorous reacts with nitric acid to give equimolar ratio of nitric oxide and nitrogen dioxide.
(a) Though nitrogen exhibits `+5` oxidation state, it does not form pentahalide. Give reason. (b) `PH_3` has lower boiling point than `NH_3`. Why ?
In white phosphorous `/_ PPP = 90^@`.
Which ordering of compounds is according to the decreasing order of the oxidation state of nitrogen ?A. `HNO_3, NO, NH_4 Cl, N_2`B. `HNO_3, NO, N_2, NH_4 Cl`C. `HNO_3, NH_4 Cl, NO,N_2`D. `NO,HNO_3, NH_4 Cl, N_2`
Why commercial `HNO_3` is generally yellow in colour ?
The product formed in the reaction of `SOCl_2` (thionyl chloride) with white phosphorous is.A. `PCl_3`B. `SO_2 Cl_2`C. `SCl_2`D. `POCl_3`
Concentrated `HNO_3`, upon long standing, turns yellow-brown due to the formation ofA. `NO`B. `NO_2`C. `N_2 O`D. `N_2 O_4`
When sulphur is boiled is boiled with `Na_2 SO_3`, a compound `(X)` is produced, `(X)` with excess of `AgNO_3` solution gives a compound `(Y)` which is soluble in water and produces a black coloured sulphide `(Z)`. Identify compounds `(X),(Y)` and `(Z)`.