Q191
Lime putty
A.
Is made from hydraulic lime
B.
Is made by adding lime to water
AnswerC.
Can be used only upto three days
D.
All of above
Answer: Option B
Solution
Answer: Option B
Solution:
Lime putty is prepared by slaking quicklime with water. During this process, quicklime (CaO) reacts vigorously with water to form calcium hydroxide [Ca(OH)₂], which is then kept under water for a period to mature and form a smooth paste known as lime putty.Option A: Incorrect, because lime putty is not made from hydraulic lime. Hydraulic lime sets under water due to the presence of clay impurities and is not suitable for making lime putty.
Option B: Correct, because lime putty is obtained by adding quicklime to water and allowing it to slake and mature.
Option C: Incorrect, since lime putty improves with age and can be stored for a long time (even months or years) if kept properly under water.
Option D: Incorrect, because only option B is true while A and C are false.