$1.$ Which process is primarily used for the manufacture of soda ash?

$-$ a$)$ Haber process

$-$ b$)$ Solvay process

$-$ c$)$ Contact process

$-$ d$)$ Ostwald process

$2.$ In the Solvay process, what is the role of ammonia?

$-$ a$)$ Reactant

$-$ b$)$ Catalyst

$-$ c$)$ Product

$-$ d$)$ By$-$product