Which of the following will give phosphoric acid one reaction with water_________________?

A. Pci5
B. P2o3
C. P2o5
D. All of the above

Phosphorus is a Greek word and it means_________________?

A. Light bearing
B. Fire
C. Impure
D. Tetrahedral

Allotropic form of phosphorus that is poisonous is___________________?

A. White
B. Red
C. Black
D. Violet

Acetic anhydride can be obtained by treating ethyl alcohol with___________________?

A. P2o5
B. H2so4
C. Both a and b
D. Pci5

Phosphorous acid upon thermal decomposition yields phosphoric acid and____________________?

A. Phosphine
B. Phosphorus
C. Water
D. Phosphorus pentoxide

P2O5 is a hygroscopic powder which sublimes at______________?

A. 260°c
B. 360°c
C. 630°c
D. 620°c

Phosphoric acid is a weak acid and its basicity is____________________?

A. 1
B. 3
C. Zero
D. 2

Which of the following is different with respect to physical appearance ?

A. Arsenic
B. Phosphorus
C. Antimony
D. Bismuth

Which one of the following is not a semiconductor ?

A. Si
B. Ge
C. Se
D. Sn

The process of aluminium extraction is called__________________?

A. Hall process
B. Thermite process
C. Haber process
D. Contact process