Which of the following bases are alkalis?

Sodium hydroxide

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Potassium hydroxide

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Aluminium hydroxide

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Copper hydroxide

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Solution

The correct options are
A
Sodium hydroxide

B
Potassium hydroxide

The bases that dissolve in water and generate hydroxyl ion $[(O H)^{-}]$ are called alkalis.

Sodium hydroxide and potassium hydroxide are alkalis as they are water soluble. Aluminium hydroxide and copper hydroxide do not dissolve in water and are non-alkalis.

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Similar questions

Q. Which of the following is not a base?

(a) sodium hydroxide
(b) magnesium hydroxide
(c) copper carbonate
(d) ammonium hydroxide

Q. Which of the following statements are correct from the given statements?
(i)

B F_{3}

is acid according to Lewis theory
(ii) Sodium hydroxide and potassium hydroxide are soluble in water.
(iii) Calcium hydroxide and magnesium hydroxide are partially soluble in water.
(iv) All metallic hydroxides react with bases to form their respective metallic salts.

You are given a mixture of precipitated copper hydroxide and zinc hydroxide. Name a solvent which will dissolve:
(a) only copper hydroxide
(b) only zinc hydroxide
(c) both copper hydroxide and zinc hydroxide.

Q. Write the formula of the following compounds.
calcium hydroxide, copper chloride, iron sulphate, sodium carbonate, copper nitrate, copper oxide, lead sulphide, magnesium chloride, zinc sulphate, potassium hydroxide.

Define the acidity of a base. What is the acidity of ammonium hydroxide, magnesium hydroxide, and aluminium hydroxide?

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