CBSE Class 10 Science 2023 Delhi Set 1

Question : 5

Total: 39

Sodium hydroxide is termed an alkali while Ferric hydroxide is not because:

Sodium hydroxide is a strong base, while Ferric hydroxide is a weak base.
Sodium hydroxide is a base which is soluble in water while Ferric hydroxide is also a base but it is not soluble in water.
Sodium hydroxide is a strong base while Ferric hydroxide is a strong acid.
Sodium hydroxide and Ferric hydroxide both are strong base but the solubility of sodium hydroxide in water is comparatively higher than that of Ferric hydroxide.

Solution:

Alkalis are the bases which dissolve in water. NaOH is sparingly soluble in water while Fe(OH)3 is not. Hence, NaOH is an alkali while Fe(OH)3 is not. All alkalis are bases but all bases are not alkalis.

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