RRB Technician 2013 Ques 4
Question: Permanent hardness of water may be removed by the addition of
Options:
A) potash alum
B) lime
C) sodium carbonate
D) potassium permanganate
Show Answer
Answer:
Correct Answer: C
Solution:
- Permanent hardness of water can be removed by the addition of washing soda $ Na _2CO _3 $ .
BETA
