Hydrated sodium aluminium silicate is called

The reactivity of sodium metal with water is utilized in which of the following processes?

Which of the following elements does not exhibit variable valency?

Which among the following is used as a source of oxygen in submarines in emergency breathing apparatus?

Select the correct statement from the following.

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.