Question

The chemical reaction between quicklime and water is characterised by
(a) evolution of hydrogen gas
(b) formation of slaked lime precipitate
(c) change in temperature of mixture
(d) change in colour of the product

Answer 1

Answer:

Answer:- b) Formation of slaked lime

Answer 2

Characteristic of chemical reaction:

The chemical reaction between quicklime and water is characterised by (c) change in temperature of mixture.

Explanation:

$C a O_{(s)}+H_{2} O_{(l)} \rightarrow C a(O H)_{2(s)}$

The quicklime reacts with water to form calcium hydroxide which is slaked lime. In this reaction, heat energy is released during formation of product. This reaction is an exothermic reaction.

Uses of calcium hydroxide:

• This is used as flocculant in sewage treatment.
• Due to its low toxicity, it is widely used in nixtamalization and used with betel leaf which helps in digestion.
• It is used in snuffing of tobacco leaves.
• In this also used for painting houses.