Which of the following is not alkali?
Correct answer: B. CaO
- A. NaOH
- B. CaO
- C. Al(OH)₃
- D. All of these
Explanation
The correct answer is Option B: CaO. Calcium oxide (CaO) is not an alkali; it is a basic oxide that reacts with water to form calcium hydroxide (Ca(OH)₂), which is an alkali. Sodium hydroxide (NaOH) is a strong alkali, making Option A incorrect. Aluminum hydroxide (Al(OH)₃) is amphoteric and not classified as an alkali, but it can neutralize acids and bases, so it is not the correct answer either. Option D is incorrect because not all listed substances are non-alkalis, as NaOH is clearly an alkali.
Last updated
About Acids, Bases and Salts
Acid and base behaviour is explained through the Bronsted-Lowry transfer of protons and the Lewis donation or acceptance of electron pairs. The topic includes pH, pOH, ionisation and water equilibrium, plus salt formation and hydrolysis, where a salt solution may become acidic, basic or neutral.
Practise Acids, Bases and Salts
314 free Acids, Bases and Salts MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Chemistry questions like this
Chemistry is on 12 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
All of the following are postulates of Arrhenius theory of ionization except
Which of the following aqueous solution will be basic?
A start of reaction, concentration of reactants are on
An acid that can act as an oxidizing, dehydrating and acid-producing agent is
Which of the following compounds is the strongest Bronsted acid