State whether the following statements are true or false. Correct the false statement.
(1) Coke is used in production of water gas i.e. (CO2 + H2O).
(2) Structural formula of propyne is CH3 – C = CH.
(3) CO2 is used to make aerated drinks.
(4) Methane gas is black in colour.
(5) Production of biogas is aerobic process.