Which of the following is soda lime?

NaOH + CaO

The correct answer is option 4. \(NaOH + CaO\).

Soda-lime is a mixture of Sodium hydroxide (NaOH) and Calcium oxide (CaO).

The Chemical formula of the soda lime is \(CaHNaO_2\).

The main components present in soda-lime are Calcium hydroxide(about 75%), Water (about 20% ), Sodium hydroxide (about 3%), and Potassium hydroxide (about 1%).

It is mainly used to absorb moisture and gases.

Soda-lime is used in gas masks as an absorbent for toxic gases.

Soda-lime causes severe damage to the gastrointestinal tract.