Which of the following is the strongest reducing agent?

The reducing power of a metal depends on various factors. Suggest the factor which makes $Li$ metal the strongest reducing agent in aqueous solution.

What is the product formed when sodium is heated in a current of dry ammonia?

Which of the following does not participate in the Solvay process for the manufacture of $Na_2CO_3$?

Fill in the blanks:
$(1)$ ......... method is used to prepare sodium carbonate.
$(2)$ Sodium carbonate exists as .........
$(3)$ Sodium chloride is commonly known as .........
$(4)$ Sodium chloride melts at ......... temperature.

$NaHCO_3$ can be manufactured by Solvay's process but $K_2CO_3$ cannot be prepared because