The acid which removes water from flesh
HCl
HNO3
H2SO3
H2SO4
Gypsum is
CaSO42H2O
2CaSO4H2O
CaSO4
CaCl2
The sulphur compound used as a food preservative
SO2
SO3
H2S2O7
The catalyst used in this reaction is
Platinum
Iron
Nickel
Palladium
The process in which sulphur is extracted is
Haber process
Killin's process
Frasch process
Hall's Process
Galena is
Zns
Pbs
CuFeS2
TnS
