Which of these is an example of a physical change?

By Megha Chandrashekar

Oxidation number of P in PO43- ion is____. ­

Which of these is an example of a physical change?

-3
+7
+5
+3

Option 3 : +5

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Megha Chandrashekar is a former Special Education Assistant who now spends her days running after her toddlers, all the while pursuing a freelance writing career