Consider the following statements : 
I) Baking soda is an acidic salt whereas common salt is a basic salt.
II) The water extract of spinach does not change the colour of red litums solution
III) Organic matter neutralises the acidic nature of the soil
IV) Lime water is acidic in nature.
The incorrect statement(s) is/are
 

1) Baking soda is an basic salt whereas common salt is a neutral salt.
2) The acidic nature of the soil is neutralized by lime stone or CaCO₃ or CaO 
3) Lime water is basic in nature.
4) The water extract of spinach does not change the colour of red litmus solution because it has oxalic acid. It is an acid. Hence acids does not turn red litmus.