Hydroxide of which alkali metal is used in the manufacture of soft soap?

Alkali metals $(M)$ dissolve in liquid $NH_{3}$ to give

Zinc $(II)$ ion on reaction with $NaOH$ first gives a white precipitate which dissolves in excess of $NaOH$ due to the formation of:

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

Which of the following is not an ore of magnesium?

Give the general electronic configuration of alkali metals and provide the electronic configuration for each element of the alkali metal group.