Which of the following properties is $NOT$ correct for alkali metals?

Mercury is transported in metal containers made of

$KO_2$ finds use in oxygen cylinders used for space and submarines. The fact$(s)$ related to such use of $KO_2$ is/are:

Which of the following metals will react with water?

Starting with sodium chloride,how would you proceed to prepare:
$(i)$ sodium metal
$(ii)$ sodium hydroxide
$(iii)$ sodium peroxide
$(iv)$ sodium carbonate?

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