"Electron" is an alloy of

Salt $A + S \to B \xrightarrow{BaCl_2}$ White precipitate.
$A$ is paramagnetic in nature and contains about $55\% \, K$. Thus,$A$ is

Two alkali halide salts,$ACl$ and $BCl$,gave crimson red and violet colors in their flame tests,respectively. $A$ and $B$ are respectively:

Which alkali metal during flame test will show color corresponding to maximum wavelength?

Compound $A$ is prepared by the electrolysis of an aqueous solution of $B$ using a Castner-Kellner cell with mercury as the cathode and carbon as the anode. $A$ and $B$ respectively are:

Beryllium is placed above magnesium in the second group. Beryllium dust,therefore,when added to $MgCl_2$ solution will: