Write complete balanced reactions for the following :
(a) Red phosphorous reacts with iodine in presence of water.
(b) White phosphrous is boiled with a strong solution of `NaOH` in an inert atmosphere.
( c) Phosphorous reacts with conc. `HNO_3` to give `H_3PO_4`.
(d) Iodine reacts with concentrated nitric acid.
(e) Orthophosphoric acid is heated with nitric acid and ammonium molybdate.
(f) Disodium hydrogen phosphate is added to ammonical solution of magnesium sulphate.
(g) Magnesium is burnt in air and the product is treated with water.
(h) Phosphine is passed through `AgNO_3` solution.
(i) A mixture of air and ammonia is passed over heated platinum gauze.
(j) Gold is treated with aqua regia.
(k) Water is added to calcium phosphide.
(l) Calcium phosphate is heated with a mixture of sand and carbon.
(m) Phosphorous reacts with nitric acid to give equimolar ratio of nitric oxide and nitrogen dioxide.
(n) Zinc is treated the very dilute nitric acid.
(o) Phosphine is treated with an acidified `CuSO_4` solution.

Explanation

(a) `P_4(Red) + 6 I_2 rarr 4 P I_3`
`2 PI_3 + 3H_2 O rarr H_3 PO_3 + 3 HI`
(b) `underset("White")(P_4) + 3NaOH + H_2 O rarr underset("Soldium hypophosphite")(3 NaH_2PO_2) + underset ("Phosphine")(4PH_3)`
( c) `P_4 + 20 HNO_3 rarr 4 H_3PO_4 + 20 NO_2 + 4 H_2 O`
(d) `I_2 + 10 HNO_3(conc). rarr 2 HIO_3 + 10 NO_2 + 4 H_2 O`
( e) `H_3PO_4 + 21 HNO_3 + 12 (NH_4)_2 MoO_4 rarr (NH_4)_3 PO_4. 12 MoO_3 + 21 NH_4 NO_3 + 12 H_2 O`
(f) `Na_2 HPO_4 + MgSO_4 + NH_4OH rarr MaNH_4 PO_4 + Na_2 SO_4 + H_2 O`