Engineering Chemistry Laboratory Viva voice questions and answers
4. Determination of Dissolved Oxygen in Water [Winkler's Method]
Chemistry (Lab) Practical : Viva – voice questions & answers
Engineering Chemistry Laboratory : 4. Determination of Dissolved Oxygen in Water [Winkler's Method] ] : Viva – voice questions & answers
VIVA – VOICE QUESTIONS & ANSWERS
4. Determination of Dissolved Oxygen in Water [Winkler's Method] ]
1.
What is meant by DO.
DO
is knowthing but dissolved oxygen i.e., the amount of dissolved oxygen present
in water.
2.
How much amount of dissolved oxygen generally present in cold water.
7
- 9 mgs/lit at 25 - 35°C
3.
What is the name of method used in the determination of DO.
Winkler's
method
4.
What is Winkler's reagent.
Potassium
bromide + Potassium bromate
5.
What is the name of indicator used here.
Starch
6.
What is the colour change.
Disappearance
of blue colour
7.
What is the equivalent weight and mol. weight of O2.
mol.wt
= 16
eq.wt
= 8
8.
What is the formula used to calculate amount of DO from normality.
Normality
× 8 × 1000 mgs/lit
9.
Write the formula of Potassium dichromate.
K2Cr2O7
10.
How will you standardise sodium thiosulphate.
Using
standard potassium dichromate solution
11.
What is the link solution used in the estimation of DO.
Engineering Chemistry Laboratory Viva voice questions and answers : Tag: : Chemistry (Lab) Practical : Viva – voice questions & answers - 4. Determination of Dissolved Oxygen in Water [Winkler's Method]
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