Preliminary Tests- Dry Heating

Question 0

Colourless gas., suffocating smell

Answer 0

SO2 gas, SO2 -3

Turns acidified K2Cr2O7 solution or paper GREEN

Question 1

Colourless gas , rotten egg smell

Answer 1

H2s gas , s2-,

Turns lead acetate paper black

Question 2

Colourless gas, pungent smell

Answer 2

Hcl gas , Cl-
White fumes with NH3
White ppt with AgNO3 solution