1
JEE Main 2018 (Online) 15th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
Following four solutions are prepared by mixing different volumes of NaOH and HCl of different concentrations, pH of which one of them will be equal to 1 ?
A
100 mL $${M \over {10}}$$ HCl + 100 mL $${M \over {10}}$$ NaOH
B
75 mL $${M \over {5}}$$ HCl + 25 mL $${M \over {5}}$$ NaOH
C
60 mL $${M \over {10}}$$ HCl + 40 mL $${M \over {10}}$$ NaOH
D
55 mL $${M \over {10}}$$ HCl + 45 mL $${M \over {10}}$$ NaOH
2
JEE Main 2018 (Online) 15th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
Biochemical Oxygen Demand (BOD) value can be a measure of water pollution caused by the organic matter. Which of the following statements is correct ?
A
Aerobic bacteria decrease the BOD value.
B
Anaerobic bacteria increase the BOD value.
C
Clean water has BOD value higher than 10 ppm.
D
Polluted water has BOD value higher than 10 ppm.
3
JEE Main 2018 (Online) 15th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
The number of P $$-$$ O bonds in P4O6 is :
A
6
B
9
C
12
D
18
4
JEE Main 2018 (Online) 15th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
In KO2, the nature of oxygen species and the oxydation state of oxygen atom are, respectively :
A
Oxide and $$-$$ 2
B
Superoxide and $$-$$ 1/2
C
Peroxide and $$-$$ 1/2
D
Superoxide and $$-$$ 1
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