As per BIS 10500-2012, for which of the parameters the 'Acceptable Limit' and 'Permissible limit in the absence of alternate sources' is the same? i. Iron ii. Total Dissolved Solids iii. Total Hardness
- AOnly (i)Correct
- B(i) and (ii)
- C(ii) and (iii)
- D(i), (ii) and (iii)
Solution
Concept
Limits in IS 10500
Formula
Iron 0.3 mg/L (no relaxation); TDS 500/2000; hardness 200/600
Step-by-step solution
1. Iron: acceptable 0.3 mg/L and no relaxation, so the limits are the same. 2. TDS: 500 and 2000 mg/L. 3. Total hardness: 200 and 600 mg/L.
Explanation
Only iron has no relaxation.
Why the other options are wrong
TDS and hardness have separate permissible limits.
Shortcut
Iron: no relaxation.
Correct answer: A) Only (i)