P2O5 is a hygroscopic powder which sublimes at______________?
(A) 260°C
(B) 360°C
(C) 630°C
(D) 620°C
Phosphorous acid upon thermal decomposition yields phosphoric acid and____________________?
(A) Phosphine
(B) Phosphorus
(C) Water
(D) Phosphorus pentoxide
Acetic anhydride can be obtained by treating ethyl alcohol with___________________?
(A) P2O5
(B) H2SO4
(C) Both A and B
(D) PCI5
Allotropic form of phosphorus that is poisonous is___________________?
(A) White
(B) Red
(C) Black
(D) Violet
Phosphorus is a Greek word and it means_________________?
(A) Light bearing
(B) Fire
(C) Impure
(D) Tetrahedral
Which of the following will give phosphoric acid one reaction with water_________________?
(A) PCI5
(B) P2O3
(C) P2O5
(D) All of the above
SO3 is not absorbed in water directly because__________________?
(A) Reaction is exothermic
(B) It is insoluble in water
(C) Dilute acid is produced
(D) All of above