Lime Washing Soda Method MCQs

By: Prof. Dr. Fazal Rehman | Last updated: May 29, 2025

1. : Lime soda process is _____ costly.
(A) Moderate
(B) High
(C) Very high
(D) Less

2. : For the turbid water ____ can be used.
(A) Soap titration process
(B) Lime soda process
(C) Ion exchange process
(D) Zeolite process

3. : In lime soda process hardness of water is reduced to about _____
(A) 10-15ppm
(B) 35-40ppm
(C) 30-35ppm
(D) 15-30ppm

4. : In lime soda process the total dissolved solids are _______
(A) Remains same
(B) Not reduced
(C) Reduced
(D) Slightly reduced

5. : The reaction is carried out at _____ temperature for avoiding the reduction of the residual hardness, incomplete precipitation, and slow reaction.
(A) 30-40°C
(B) 40-50°C
(C) 60-70°C
(D) 50-60°C

6. : _______ are removed from the water by lime-soda process.
(A) Minerals
(B) Mineral complexes
(C) Mineral alkaline
(D) Mineral acids

7. : The only function of the batch process is to remove the hardness of the water on ______
(A) Large scale
(B) Small scale
(C) Industrial purposes
(D) Irrigation purposes

8. : In ____ amount, the coagulate is added in the hot lime soda process if needed.
(A) High
(B) Very low
(C) Very high
(D) Low

9. : The remaining final hardness of water is about ______ after treating by the hot lime-soda process.
(A) 10-15ppm
(B) 20-25ppm
(C) 15-20ppm
(D) 25-30ppm

10. : ____ is reduced because of heating at high temperature in the hot lime-soda process.
(A) Time for treating
(B) Energy
(C) Cost
(D) Corrosion of boiler

11. : Due to _____ bacteria in the water is reduced to a minimum in hot lime-soda process.
(A) Slow reactions
(B) Faster reactions
(C) High temperature
(D) Low temperature

12. : When the tank gets filled then it indicates that ____, in batch process.
(A) To stir more
(B) To add the lime
(C) To add the catalyst
(D) Softening is completed

13. : _____ is the reagent used in the lime-soda process.
(A) Not regenerated
(B) Regenerated
(C) Regenerated depending on the hardness
(D) Regenerated some times

14. : The change in hardness of water needs _____, in the lime-soda process.
(A) Change in dose of lime
(B) Change in dose of soda
(C) Change in dose either lime or soda
(D) Change in dose of lime and soda