Question

An alkali is a base which:

(a) Dissolves in water and is soapy to touch. (b) dissolves in water and sour in taste

(c) does not dissolve in water and is soapy in touch (d) does not dissolve in water and in sour in taste.​

Answer 1

Answer:

An alkali is a water-soluble base. These are all Group I metal hydroxides, plus calcium hydroxide (which is just soluble in water) plus ammonium hydroxide. Insoluble bases, which are not called alkalis, are all metal oxides and insoluble metal hydroxide.

Answer 2

The correct answer is option (a) Dissolves in water and is soapy to touch.

• Bases that dissolve in water and produce OH- ions are called alkali.
• Alkali is an ionic salt of alkaline earth metal or alkaline metal.
• Alkali has a pH greater than 10.
• The solution of alkali is soapy to touch due to the saponification of the oil on the surface of the skin.
• During saponification reaction, the Alkali reacts with the Easter group of fatty acids to form salts of carboxylic acid and alcohol.
• An alkaline solution is bitter in taste. Concentrated solutions are caustic(they can cause chemical burns).
• Acids are sour in taste.
• Examples of alkali are - NaOH, KOH, Ca(OH)₂

Hence, option (A) is correct.

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