Question

3. A student took solid quick lime in a china dish and added a small amount of water to it. He would hear a

(a) pop sound (b) a crackling sound (c) a hissing sound (d) no sound at all.

​

Answer 1

Answer:

c) a hissing sound

Explanation:

because the reaction of quick lime with water is exothermic

Answer 2

A student took solid quick lime in a china dish and added a small amount of water to it. He would hear a HISSING SOUND. (OPTION C)

CHEMICAL REACTION OF SLAKED LIME -

• Slaked lime or Calcium hydroxide is sparingly water-soluble.
• The reaction of slaked lime water leads to the formation of a suspension of water of lime.
• The reaction is exothermic with the release of a high amount of energy.
• In reaction, a hissing sound is produced due to heat evolution.
• The reaction is an example of a combination reaction.
• The reaction involves the phase change of water molecules from liquid to steam.
• The reaction is written as -

                                      $Ca(OH)_2(s) + H_2O (l)$ → $Ca(OH)_2(aq) + H_2O(g)$