railway DFCCIL Junior Executive 2023 (CBT 1 & CBT 2) Mock Test General Science Chemistry

Which of the following techniques can be used for reducing the total dissolved solids (TDS) in water?

(1) Ion Exchange

(2) Distillation 

(3) Carding 

1
Only 1 
2
Only 3 
3
Both 1 and 2
4
Both 2 and 3 
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