Question

Please solve the first question

Answer 1

The four gases are: 1) H2 gas 2) CO2 gas 3) SO2 gas 4) H2S gas

Their respective methods of preparations are:

1) Any carbonate salt and dilute H2SO4 gives CO2 gas.

2) Any sulphite salt and dilute H2SO4 gives SO2 gas. 4) Any sulphide salt and dilute H2SO4 gives H2S gas.