1
GATE CE 2014 Set 1
MCQ (Single Correct Answer)
+2
-0.6
For a sample of water with the ionic composition shown in the figure below, the carbonate and noncarbonate hardness concentrations (in mg/l as $${\mathrm{CaCO}}_3$$), respectively are: GATE CE 2014 Set 1 Environmental Engineering - Quality Control of Water Question 4 English
A
200 and 50
B
175 and 75
C
75 and 175
D
50 and 200
2
GATE CE 2012
MCQ (Single Correct Answer)
+2
-0.6
A water sample has a pH of 9.25. The concentration of hydroxyl ions in the water sample is
A
$$10^{-9.25}$$ moles/L
B
$$10^{-7.75}$$ moles/L
C
0.302 mg/L
D
3.020 mg/L
3
GATE CE 2010
MCQ (Single Correct Answer)
+2
-0.6
Ion concentrations obtained for a groundwater sample (having pH=8.1) are given below.
Ion $$Ca^{2+}$$ $$Mg^{2+}$$ $$Na^+$$ $$HCO_3^-$$ $$SO_4^{2-}$$ $$Cl^{-}$$
Ionconcentration(mg/L) 100 6 15 250 45 39
Atomic Weight Ca=40 Mg=24 Na=23 H=1,C=12,O=16 S=32,O=16 Cl=35.5

Total hardness (mg/L as $$CaCO_3$$) present in the above water sample is
A
205
B
250
C
275
D
308
4
GATE CE 2010
MCQ (Single Correct Answer)
+2
-0.6
Ion concentrations obtained for a groundwater sample (having pH=8.1) are given below.
Ion $$Ca^{2+}$$ $$Mg^{2+}$$ $$Na^+$$ $$HCO_3^-$$ $$SO_4^{2-}$$ $$Cl^{-}$$
Ionconcentration(mg/L) 100 6 15 250 45 39
Atomic Weight Ca=40 Mg=24 Na=23 H=1,C=12,O=16 S=32,O=16 Cl=35.5

Carbonate hardness (mg/L as $$CaCO_3$$) present in the above water sample is
A
205
B
250
C
275
D
289
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