The wire of a flash bulb is made of which of the following?

The given reaction is the result of which process?
$Na_2CO_3 \cdot 10H_2O \xrightarrow[open]{air} Na_2CO_3 \cdot H_2O + 9H_2O$

Which of the following statements are correct for alkali metal compounds?
$(i)$ Superoxides are paramagnetic in nature.
(ii) The basic strengths of hydroxides increase down the group.
(iii) The conductivity of chlorides in their aqueous solutions decreases down the group.
(iv) The basic nature of carbonates in aqueous solutions is due to cationic hydrolysis.

The following metal ion activates many enzymes,participates in the oxidation of glucose to produce $ATP$,and with $Na^+$,is responsible for the transmission of nerve signals.

$(a)$ Describe the chemical properties of alkali metals with air,water,dihydrogen,and halogens.
$(b)$ Explain the reduction potential of alkali metal elements.
$(c)$ Which type of solutions are formed on the reaction of alkali metals with liquid ammonia?

Why is $Li_{2}CO_{3}$ decomposed at a lower temperature whereas $Na_{2}CO_{3}$ at higher temperature?