Which process is associated with the production of sodium carbonate?

Select the correct statement.

Which of the following statements is not true for most of the alkali metals?

Among the hydroxides and carbonates of $IA$ and $IIA$ group elements respectively,on moving down the group,the correct solubility order is:

Which one of the following reacts with concentrated sulphuric acid?

What are the products formed when $Li_2CO_3$ undergoes thermal decomposition?