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

(c) change in temperature of mixture

Explanation:

Given we have a equation happening between quicklime and water.

• The abow equation is given by,

$CaO+H_{2}O-->Ca(OH)_{2}$

• So this equation release a huge amount of heat due to the formation of precipitate.
• This reaction is a exothermic reaction which releases a lot of heat, hence when we touch the flask we notice that the flask is too hot.
• So we see that the mixture has a change in temperature from lower to higher.
• So this reaction could be determined by the evolution of heat.

Answer 2

Characteristic of chemical reaction:

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

Explanation:

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

You can get all the answers of Chapter 1 in the link below:

https://brainly.in/question/13848082

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