Doubt by Mrinmoy Majumder

Sir

what is the by product of solvay process? 

As we all know that CaCl2  is the by product but in the question section of neet prep NH3 is given. So which is the most accurate answer?

Answers

Answer by Raghu

haa mujhe bhi iska answer hi janana hai smjh nhi aa rha..vipin sir reply kro pls