Question 13 of 31beginner🧠 RememberVery Short2 marks
Write formulas for the following compounds: (a) Mercury(II) chloride (b) Nickel(II) sulphate (c) Tin(IV) oxide (d) Thallium(I) sulphate (e) Iron(III) sulphate (f) Chromium(III) oxide
(a)
Answer
HgCl
(b)
Answer
NiSO
(c)
Answer
SnO
(d)
Answer
TlSO
(e)
Answer
Fe(SO)
(f)
Answer
CrO
Explanation
Using the Stock notation, the Roman numeral indicates the oxidation state of the metal. We balance the charges of the metal cation and the non-metal/sulphate anion to derive the molecular formula. For example, Mercury(II) has a +2 charge and chloride has a -1 charge, giving HgCl. Similarly, Thallium(I) has a +1 charge and sulphate has a -2 charge, giving TlSO.