The main salt soluble in sea water is

Which among the following statements is $NOT$ true?

Explain the preparation of sodium carbonate by the Solvay process with chemical reactions.

$KO_2$ is used in space and submarines because it

What is obtained by the electrolysis of carnallite?

The reaction of an element $A$ with water produces a combustible gas $B$ and an aqueous solution of $C.$ When another substance $D$ reacts with this solution $C,$ it also produces the same gas $B.$ $D$ also produces the same gas even on reaction with dilute $H_2SO_4$ at room temperature. Element $A$ imparts a golden yellow color to the Bunsen flame. Then,$A, B, C,$ and $D$ may be identified as: