BOD is expressed in terms of ppm of oxygen. One kg of a water sample required 29.4 mg of acidified K2Cr2O7 to oxidize all the micro organisms. BOD of water sample is

# BOD is expressed in terms of ppm of oxygen. One kg of a water sample required 29.4 mg of acidified ${\mathrm{K}}_{2}{\mathrm{Cr}}_{2}{\mathrm{O}}_{7}$ to oxidize all the micro organisms. BOD of water sample is

1. A

4.8

2. B

29.4

3. C

8.4

4. D

24.8

Fill Out the Form for Expert Academic Guidance!l

+91

Live ClassesBooksTest SeriesSelf Learning

Verify OTP Code (required)

### Solution:

$\begin{array}{l}{10}^{3\text{\hspace{0.17em}\hspace{0.17em}}}\mathrm{grams}\text{\hspace{0.17em}\hspace{0.17em}}\mathrm{water}\text{\hspace{0.17em}\hspace{0.17em}}\mathrm{reuired}\text{\hspace{0.17em}\hspace{0.17em}}29.4×{10}^{-3}\text{\hspace{0.17em}\hspace{0.17em}}\mathrm{grams}\text{\hspace{0.17em}\hspace{0.17em}}\mathrm{of}\text{\hspace{0.17em}\hspace{0.17em}}{\mathrm{K}}_{2}{\mathrm{Cr}}_{2}{\mathrm{O}}_{7}/{\mathrm{H}}^{+}\\ {10}^{6\text{\hspace{0.17em}\hspace{0.17em}}}\mathrm{grams}\text{\hspace{0.17em}\hspace{0.17em}}\mathrm{water}\text{\hspace{0.17em}\hspace{0.17em}}\mathrm{reuired}\text{\hspace{0.17em}\hspace{0.17em}}\text{'}\mathrm{X}\text{'}\text{\hspace{0.17em}\hspace{0.17em}}\mathrm{grams}\text{\hspace{0.17em}\hspace{0.17em}}\mathrm{of}\text{\hspace{0.17em}\hspace{0.17em}}{\mathrm{K}}_{2}{\mathrm{Cr}}_{2}{\mathrm{O}}_{7}/{\mathrm{H}}^{+}\\ \mathrm{X}=29.4\\ \mathrm{One}\text{\hspace{0.17em}\hspace{0.17em}}\mathrm{GEW}\text{\hspace{0.17em}\hspace{0.17em}}\mathrm{of}\text{\hspace{0.17em}\hspace{0.17em}}{\mathrm{K}}_{2}{\mathrm{Cr}}_{2}{\mathrm{O}}_{7}/{\mathrm{H}}^{+}\left(49\text{\hspace{0.17em}\hspace{0.17em}}\mathrm{grams}\right)=\mathrm{one}\text{\hspace{0.17em}\hspace{0.17em}}\mathrm{GEW}\text{\hspace{0.17em}\hspace{0.17em}}\mathrm{of}\text{\hspace{0.17em}\hspace{0.17em}}\mathrm{oxygen}\left(8\mathrm{g}\right)\\ 29.4\mathrm{grams}\text{\hspace{0.17em}\hspace{0.17em}}\mathrm{of}\text{\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}}{\mathrm{K}}_{2}{\mathrm{Cr}}_{2}{\mathrm{O}}_{7}/{\mathrm{H}}^{+}\equiv \text{'}\mathrm{Y}\text{'}\text{\hspace{0.17em}\hspace{0.17em}}\mathrm{grams}\text{\hspace{0.17em}\hspace{0.17em}}\mathrm{of}\text{\hspace{0.17em}\hspace{0.17em}}\mathrm{oxygen}\\ \mathrm{Y}=\frac{29.4×8}{49}\mathrm{g};\\ \mathrm{Y}=4.8\text{\hspace{0.17em}\hspace{0.17em}}\mathrm{g};\\ \mathrm{BOD}\text{\hspace{0.17em}\hspace{0.17em}}\mathrm{of}\text{\hspace{0.17em}\hspace{0.17em}}\mathrm{water}\text{\hspace{0.17em}\hspace{0.17em}}\mathrm{sample}\text{\hspace{0.17em}\hspace{0.17em}}\mathrm{is}\text{\hspace{0.17em}\hspace{0.17em}}4.8\text{\hspace{0.17em}\hspace{0.17em}}\mathrm{ppm}\end{array}$

## Related content

 Scope of Psychology Top 10 Lines on Mahatma Gandhi in Hindi Hundred Dresses Part 1 MCQ English Class 10 Ovary Diagram Tongue Twisters in Hindi Top 50+ World GK questions and Answers with PDF Download 100 Sentences of Simple Present Tense in Hindi Social Issues Project Class 10 SST Past Perfect Tense in Hindi: परिभाषा, नियम, उदाहरण Silence Quotes in English and Hindi

+91

Live ClassesBooksTest SeriesSelf Learning

Verify OTP Code (required)