Sodium hydroxide is termed an alkali while ...

CBSE Class 10 Science 2023 Delhi Set 1

Question : 5 of 39

Marks: +1, -0

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.

\mathrm{NaOH}

is sparingly soluble in water while

\mathrm{Fe}(\mathrm{OH})_3

is not. Hence,

\mathrm{NaOH}

is an alkali while

\mathrm{Fe}(\mathrm{OH})_3

is not. All alkalis are bases but all bases are not alkalis.

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