(a) Define atomicity with an example.

(b) Write the historical name and systematic name of the following ions :
$C u^{+}, C u^{+ 2}, F e^{+ 2}, F e^{+ 3}$

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Solution

$(a) Atomicity is defined as the total number of atoms present in a molecule. For example, each molecule of oxygen (O_{2}) is composed of two oxygen atoms. So the atomicity of oxygen is 2.$

(b) Formula Historical name Systematic name

$(i) C u^{+}$ Cuprous ion Copper (I)
$(ii) C u^{+ 2}$ Cupric ion Copper (II)
$(iii) F e^{+ 2}$ Ferrous ion Iron (II)
$(iv) F e^{+ 3}$ Ferric ion Iron (III)

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E_{C u^{2 +} / C u^{+}}^{0} = 0.15 V; E_{C u^{+} / C u}^{0} = 0.53 V E_{C o^{3 +} / C o^{2 +}}^{0} = 1.82 V; E_{F e^{3 +} / F e^{2 +}}^{0} = 0.77 V E_{F e^{2 +} / F e}^{0} = - 0.44 V; E_{O_{2}, H^{+} / H_{2} O}^{0} = 1.23 V

C u^{+}, F e^{+}, F e^{2 +}, a n d F e^{3 +}

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