Q.

Which of the following is not a postulate of Arrhenius’s concept of acids and bases? 

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a

Non-metal oxides are generally acidic, but they do not contain hydrogen. 

b

All bases that ionize completely and hence, produce more concentration of OH– ions in their aqueous solutions are called strong bases. 

c

A base is a substance that produces OH– ions in the aqueous solution. 

d

An acid is a substance that contains hydrogen and produces H+ ions in an aqueous solution. 

answer is D.

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Detailed Solution

Arrhenius’s theory could not explain the acidic nature of substances, which do not contain hydrogen. For example, non-metal oxides are generally acidic, but they do not contain hydrogen. 

Examples: CO2, SO3, etc. 

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