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Q.

Which of the following has the lowest pH?

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a

NaOH

b

Na2O

c

CO2

d

CaO

answer is C.

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Detailed Solution

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All the metal oxides are acidic and all the non-metal oxides are basic in nature. 

Na2O and CaO are metal oxides so these are basic in nature. 

CO2 is metal oxide so it is acidic in nature.

NaOH is an example of a base.

pH of bases > pH of acids

Hence, CO2 has the lowest pH.

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