Consider the following statements regarding Orsat apparatus,

(1) The Orsat analysis is treated as an analysis of the dry combustion products

(2) Copper chloride (CuCl2) is used for the absorption of Oxygen in Orsat apparatus

(3) The Orsat analysis technique is a quick, simple, and inexpensive method for gravimetric analysis of the combustion products.

(4) In Orsat apparatus the remaining gas is assumed to be Nitrogen

Which of these following statements are true?