Which process is associated with the production of sodium carbonate?

Thermite is a mixture of

Which substance is not required in the Solvay process?

Which elements of group $1$ and $2$ differ from the other elements of the same group? Give a brief explanation of the diagonal relationship.

Oxygen gas can be prepared from solid $KMnO_4$ by

Which of the following can be used to extinguish a fire caused by sodium,potassium,and lithium?