1
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
2
GATE CE 2008
MCQ (Single Correct Answer)
+2
-0.6
A wastewater sample contains $$10^{-5.6}$$ mol/l of OH- ions at $$25^o$$ C. The pH of this sample is
A
8.6
B
8.4
C
5.6
D
5.4
3
GATE CE 2005
MCQ (Single Correct Answer)
+2
-0.6
If tomato juice is having a pH of 4.1, the hydrogen ion concentration will be
A
10.94 x $$10^{-5}$$ mol/l
B
9.94 x $$10^{-5}$$ mol/l
C
8.94 x $$10^{-5}$$ mol/l
D
7.94 x $$10^{-5}$$ mol/l
4
GATE CE 2000
MCQ (Single Correct Answer)
+2
-0.6
Two Samples of Water A and B have pH values of a 4.4 and 6.4 respectively. How many times more acidic sample A is than sample B
A
0
B
15
C
100
D
200
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Fluid Mechanics and Hydraulic Machines
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