Civil Engineering - Water Supply Engineering - Discussion

Discussion Forum : Water Supply Engineering - Section 1 (Q.No. 7)
Pick up the correct statement from the following :
Excess quantities of iron and manganese in water, cause discolouration of clothes
Lead and barium salts have toxic effect
Arsenic and selenium are poisonous to human health
Higher copper content affects the lungs
All the above.
Answer: Option
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