What do you understand by an alkali?

Give two examples of :

(a) strong alkalis, (b) weak alkalis.

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Solution

A compound with particular chemical properties including turning litmus blue and neutralizing or effervescing with acids; typically, a caustic or corrosive substance of this kind such as lime or soda.

Alkali salts are soluble hydroxides ofalkali metals and alkaline earth metals,
An alkali is a substance with a pH value of more than 7

(a)sodium hydroxide (NaOH)
potassium hydroxide(KOH)
and calcium hydroxide(CaOH)

(b)
Aluminium hydroxide (Al(OH)3)
Ammonium hydroxide(NH4OH)

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Q. Name
(a) a metallic hydroxide soluble in excess of NH₄OH.
(b) a metallic oxide soluble in excess of caustic soda solution.
(c) a strong alkali
(d) a weak alkali
(e) two coloured metal ions.
(f) two bases which are not alkalis but dissolve in strong alkalis.
(g) a coloured metallic oxide which dissolves in alkalis to yield colourless solutions.

(a) What do you understand by amphoteric oxide ? (b) Give the balanced equations for the reaction with two different amphoteric oxides with a caustic alkali. (c) Name the products formed.

What are alkali metals? Give two examples. [2 MARKS]

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Alkali

Standard X Chemistry

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What do you understand by an alkali? Give two examples of : (a) strong alkalis, (b) weak alkalis.

What do you understand by an alkali?

Give two examples of :

(a) strong alkalis, (b) weak alkalis.