The decolourization of the purple colour of tetraoxomaganates(VII) ion is a test for

A correct electrochemical series can be obtained from K, Na, Ca, Al, Mg, Zn, Fe, Pb, H, Cu, Hg, Ag, Au by interchanging

A particle that contains 11 protons, 12 neutrons and 10 electrons is probably a

When cathode rays are deflected unto the electrode of an electrometer. the instrument becomes