Question

SECTION B Lo make ure thea Write chemical formulas for the following compounds: magnesium chromate silver fluoride cobalt(III) sulfide tin(II) perchlorate lithium nitride aluminum sulfate zinc iodide aluminum sulfite lead(IV) carbonate nickel (II) phosphide

Answer 1

All the formulas are on the basis of charge balancing, so first we shall be writing the formulas of all positive ions and then all negative ions, following the criss-cross method

Colbalt (u) Sulfide CoS tialu) perchlorate Sn (CIO) Lithium nitride LigN Aluminium Sulfale A (so Zinc lodide ZI2 Al. (so) Aluminium Sulfe Pb (cos)2 Lead (n) Carbonale Nickel () Phasphide NigR

dist of Cations A Magnesium MR silver AS Cotalt (1) Cat3 tisn(u) Sa (Latin Snt2 name, stannum, Sn) dithium Aluminium Alt3 Line Lead (v) PS (ltin name, Plumbum, Pb) Mickel lu) Nitz

List of Chromate CrO Huori de Sulfide Sulphate or Sulfale (S0) Sulfite (So,) lodide S2 Carbonate Nitride Phasphide Perchlorate Cl04 pa3

Criss Cross MethodTherpe's) The ralue of charge (uithout sign) of frst ion is used as subs cript of second ion and vice versa . The subcript are then reduced by peatert common facto det us understand by viing formula f () lead Carbonale wrile tve ions on left Pb right and -ve ion on (Pb (Co liminating eamman tactor fom et The fermula 2,4 we Pb(Co) use (brackets f (2) Aluminium Sulphile complex ions A Al, (SO There is no common- factor So, this t be frmula Similaly, we can write lher formalas as Magnesium chromate slver fluoride M3 CrO4 AgF