NCERT Class XII Chemistry <br> Chapter - The p-Block Elements <br> Questions with Solutions

NCERT Class XII Chemistry
Chapter - The p-Block Elements
Questions with Solutions

Question : 31

Total: 74

What are the oxidation states of phosphorus in the following :
(i) H3PO3
(ii) PCl3
(iii) Ca3P2
(iv) Na3PO4
(v) POF3?

Solution:

Let the oxidation state of P be x.
(i)

+1‌‌x−2

H3PO3

∴3(+1)+x+3(–2)=0 or x=+3

(ii)

x −1

PCl3

∴x+3(–1)=0 or x=+3

(iii)

+2‌‌‌x

Ca3P2

∴3(+2)+2×x=0 or x=−3

(iv)

+1‌‌‌x−2

Na3PO4

∴3(+1)+x+4(−2)=0 or x=+5

(v)

x−2‌−1

P O F3

∴x+1(−2)+3(−1)=0 or x=+5

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