The formula of crystalline copper sulphate is
CuSO4H2 O
CuSO43H2 O
CuSO4 7H2 O
CuSO4 5H2 O
The formula of oleum is
H2SO4
H2SO3
H2S2O7
H2S2O8
The apparatus used for the preparation of hydrogen sulphide is
Bergius apparatus
Kipps' apparatus
fractional column
Distillation flask
The formula of sugar is
C6 H12O6
C12 H22O11
C5 H10O5
H2SO2O7
The pink colour of potassium permanganate disappears by the addition of
SO2
HCl
H2S
CO2
The allotrope of sulphur which is insoluble in carbon disulphide
Rhombic sulphur
Monoclinic sulphur
Plastic sulphur
Powdered sulphur
The black mass obtained on adding concentrated sulphuric acid to starch is
C2H2
C
The gas formed when hydrogen sulphide is burnt in excess of oxygen
NO2
