Water Pollution
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CHXI14:ENVIRONMENTAL CHEMISTRY

318587 \({\text{100}}\,\,{\text{ml}}\) of sample of water requires \({\text{3}}{\text{.92}}\,\,{\text{mg}}\) of \(\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\) in presence of \(\mathrm{H}_{2} \mathrm{SO}_{4}\) for the oxidation of dissolved organic matter present in it. The COD of the water sample in ppm

1 3.1
2 6.4
3 12.4
4 8.2
CHXI14:ENVIRONMENTAL CHEMISTRY

318588 \(10 \mathrm{~mL}\) of water requires \({\text{1}}{\text{.47}}\,\,{\text{mg}}\) of \(\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\) (Mol. wt. \(\left.=294\right)\) for oxidation of dissolved organic matter. The C.O.D. of water is

1 \({\text{2}}{\text{.44}}\,\,{\text{ppm}}\)
2 \({\text{24}}\,\,{\text{ppm}}\)
3 \({\text{32}}\,\,{\text{ppm}}\)
4 \({\text{1}}{\text{.6}}\,\,{\text{ppm}}\)
CHXI14:ENVIRONMENTAL CHEMISTRY

318589 BOD is connected with:

1 Microbes and organic matter
2 Organic matter
3 Microbes
4 None of the above
CHXI14:ENVIRONMENTAL CHEMISTRY

318590 \(100 \mathrm{ml}\) of a sample of water requires \(0.98 \mathrm{mg}\) of \(\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\) (M.W. \(=294\) ) in presence of the \(\mathrm{H}_{2} \mathrm{SO}_{4}\) for the oxidation of dissolved orgamic matter in it. The C.O.D of the water sample is

1 \({\text{78}}{\text{.4}}\,\,{\text{ppm}}\)
2 \({\text{1}}{\text{.6}}\,\,{\text{ppm}}\)
3 \({\text{3}}{\text{.2}}{\mkern 1mu} \,{\mkern 1mu} {\text{ppm}}\)
4 \({\text{6}}{\text{.4}}\,\,{\text{ppm}}\)
CHXI14:ENVIRONMENTAL CHEMISTRY

318591 B.O.D values of four samples of water (i), (ii), (iii) and (iv) is given below
(i) \({\text{160}}\,\,{\text{ppm}}\)
(ii) \({\text{35}}\,\,{\text{ppm}}\)
(iii)\({\text{180}}\,\,{\text{ppm}}\)
(iv) \({\text{25}}\,\,{\text{ppm}}\)
The decreasing order of extent of pollution in water is

1 (iii) \(>\) (i) \(>\) (iv) \(>\) (ii)
2 (iv) \(>\) (ii) \(>\) (i) \(>\) (iii)
3 (iii) \(>\) (i) \(>\) (ii) \(>\) (iv)
4 (iv) \(>\) (i) \(>\) (ii) \(>\) (iii)
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CHXI14:ENVIRONMENTAL CHEMISTRY

318587 \({\text{100}}\,\,{\text{ml}}\) of sample of water requires \({\text{3}}{\text{.92}}\,\,{\text{mg}}\) of \(\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\) in presence of \(\mathrm{H}_{2} \mathrm{SO}_{4}\) for the oxidation of dissolved organic matter present in it. The COD of the water sample in ppm

1 3.1
2 6.4
3 12.4
4 8.2
CHXI14:ENVIRONMENTAL CHEMISTRY

318588 \(10 \mathrm{~mL}\) of water requires \({\text{1}}{\text{.47}}\,\,{\text{mg}}\) of \(\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\) (Mol. wt. \(\left.=294\right)\) for oxidation of dissolved organic matter. The C.O.D. of water is

1 \({\text{2}}{\text{.44}}\,\,{\text{ppm}}\)
2 \({\text{24}}\,\,{\text{ppm}}\)
3 \({\text{32}}\,\,{\text{ppm}}\)
4 \({\text{1}}{\text{.6}}\,\,{\text{ppm}}\)
CHXI14:ENVIRONMENTAL CHEMISTRY

318589 BOD is connected with:

1 Microbes and organic matter
2 Organic matter
3 Microbes
4 None of the above
CHXI14:ENVIRONMENTAL CHEMISTRY

318590 \(100 \mathrm{ml}\) of a sample of water requires \(0.98 \mathrm{mg}\) of \(\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\) (M.W. \(=294\) ) in presence of the \(\mathrm{H}_{2} \mathrm{SO}_{4}\) for the oxidation of dissolved orgamic matter in it. The C.O.D of the water sample is

1 \({\text{78}}{\text{.4}}\,\,{\text{ppm}}\)
2 \({\text{1}}{\text{.6}}\,\,{\text{ppm}}\)
3 \({\text{3}}{\text{.2}}{\mkern 1mu} \,{\mkern 1mu} {\text{ppm}}\)
4 \({\text{6}}{\text{.4}}\,\,{\text{ppm}}\)
CHXI14:ENVIRONMENTAL CHEMISTRY

318591 B.O.D values of four samples of water (i), (ii), (iii) and (iv) is given below
(i) \({\text{160}}\,\,{\text{ppm}}\)
(ii) \({\text{35}}\,\,{\text{ppm}}\)
(iii)\({\text{180}}\,\,{\text{ppm}}\)
(iv) \({\text{25}}\,\,{\text{ppm}}\)
The decreasing order of extent of pollution in water is

1 (iii) \(>\) (i) \(>\) (iv) \(>\) (ii)
2 (iv) \(>\) (ii) \(>\) (i) \(>\) (iii)
3 (iii) \(>\) (i) \(>\) (ii) \(>\) (iv)
4 (iv) \(>\) (i) \(>\) (ii) \(>\) (iii)
For More Updates join with Us
CHXI14:ENVIRONMENTAL CHEMISTRY

318587 \({\text{100}}\,\,{\text{ml}}\) of sample of water requires \({\text{3}}{\text{.92}}\,\,{\text{mg}}\) of \(\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\) in presence of \(\mathrm{H}_{2} \mathrm{SO}_{4}\) for the oxidation of dissolved organic matter present in it. The COD of the water sample in ppm

1 3.1
2 6.4
3 12.4
4 8.2
CHXI14:ENVIRONMENTAL CHEMISTRY

318588 \(10 \mathrm{~mL}\) of water requires \({\text{1}}{\text{.47}}\,\,{\text{mg}}\) of \(\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\) (Mol. wt. \(\left.=294\right)\) for oxidation of dissolved organic matter. The C.O.D. of water is

1 \({\text{2}}{\text{.44}}\,\,{\text{ppm}}\)
2 \({\text{24}}\,\,{\text{ppm}}\)
3 \({\text{32}}\,\,{\text{ppm}}\)
4 \({\text{1}}{\text{.6}}\,\,{\text{ppm}}\)
CHXI14:ENVIRONMENTAL CHEMISTRY

318589 BOD is connected with:

1 Microbes and organic matter
2 Organic matter
3 Microbes
4 None of the above
CHXI14:ENVIRONMENTAL CHEMISTRY

318590 \(100 \mathrm{ml}\) of a sample of water requires \(0.98 \mathrm{mg}\) of \(\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\) (M.W. \(=294\) ) in presence of the \(\mathrm{H}_{2} \mathrm{SO}_{4}\) for the oxidation of dissolved orgamic matter in it. The C.O.D of the water sample is

1 \({\text{78}}{\text{.4}}\,\,{\text{ppm}}\)
2 \({\text{1}}{\text{.6}}\,\,{\text{ppm}}\)
3 \({\text{3}}{\text{.2}}{\mkern 1mu} \,{\mkern 1mu} {\text{ppm}}\)
4 \({\text{6}}{\text{.4}}\,\,{\text{ppm}}\)
CHXI14:ENVIRONMENTAL CHEMISTRY

318591 B.O.D values of four samples of water (i), (ii), (iii) and (iv) is given below
(i) \({\text{160}}\,\,{\text{ppm}}\)
(ii) \({\text{35}}\,\,{\text{ppm}}\)
(iii)\({\text{180}}\,\,{\text{ppm}}\)
(iv) \({\text{25}}\,\,{\text{ppm}}\)
The decreasing order of extent of pollution in water is

1 (iii) \(>\) (i) \(>\) (iv) \(>\) (ii)
2 (iv) \(>\) (ii) \(>\) (i) \(>\) (iii)
3 (iii) \(>\) (i) \(>\) (ii) \(>\) (iv)
4 (iv) \(>\) (i) \(>\) (ii) \(>\) (iii)
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CHXI14:ENVIRONMENTAL CHEMISTRY

318587 \({\text{100}}\,\,{\text{ml}}\) of sample of water requires \({\text{3}}{\text{.92}}\,\,{\text{mg}}\) of \(\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\) in presence of \(\mathrm{H}_{2} \mathrm{SO}_{4}\) for the oxidation of dissolved organic matter present in it. The COD of the water sample in ppm

1 3.1
2 6.4
3 12.4
4 8.2
CHXI14:ENVIRONMENTAL CHEMISTRY

318588 \(10 \mathrm{~mL}\) of water requires \({\text{1}}{\text{.47}}\,\,{\text{mg}}\) of \(\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\) (Mol. wt. \(\left.=294\right)\) for oxidation of dissolved organic matter. The C.O.D. of water is

1 \({\text{2}}{\text{.44}}\,\,{\text{ppm}}\)
2 \({\text{24}}\,\,{\text{ppm}}\)
3 \({\text{32}}\,\,{\text{ppm}}\)
4 \({\text{1}}{\text{.6}}\,\,{\text{ppm}}\)
CHXI14:ENVIRONMENTAL CHEMISTRY

318589 BOD is connected with:

1 Microbes and organic matter
2 Organic matter
3 Microbes
4 None of the above
CHXI14:ENVIRONMENTAL CHEMISTRY

318590 \(100 \mathrm{ml}\) of a sample of water requires \(0.98 \mathrm{mg}\) of \(\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\) (M.W. \(=294\) ) in presence of the \(\mathrm{H}_{2} \mathrm{SO}_{4}\) for the oxidation of dissolved orgamic matter in it. The C.O.D of the water sample is

1 \({\text{78}}{\text{.4}}\,\,{\text{ppm}}\)
2 \({\text{1}}{\text{.6}}\,\,{\text{ppm}}\)
3 \({\text{3}}{\text{.2}}{\mkern 1mu} \,{\mkern 1mu} {\text{ppm}}\)
4 \({\text{6}}{\text{.4}}\,\,{\text{ppm}}\)
CHXI14:ENVIRONMENTAL CHEMISTRY

318591 B.O.D values of four samples of water (i), (ii), (iii) and (iv) is given below
(i) \({\text{160}}\,\,{\text{ppm}}\)
(ii) \({\text{35}}\,\,{\text{ppm}}\)
(iii)\({\text{180}}\,\,{\text{ppm}}\)
(iv) \({\text{25}}\,\,{\text{ppm}}\)
The decreasing order of extent of pollution in water is

1 (iii) \(>\) (i) \(>\) (iv) \(>\) (ii)
2 (iv) \(>\) (ii) \(>\) (i) \(>\) (iii)
3 (iii) \(>\) (i) \(>\) (ii) \(>\) (iv)
4 (iv) \(>\) (i) \(>\) (ii) \(>\) (iii)
Join With Us for More Updates
CHXI14:ENVIRONMENTAL CHEMISTRY

318587 \({\text{100}}\,\,{\text{ml}}\) of sample of water requires \({\text{3}}{\text{.92}}\,\,{\text{mg}}\) of \(\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\) in presence of \(\mathrm{H}_{2} \mathrm{SO}_{4}\) for the oxidation of dissolved organic matter present in it. The COD of the water sample in ppm

1 3.1
2 6.4
3 12.4
4 8.2
CHXI14:ENVIRONMENTAL CHEMISTRY

318588 \(10 \mathrm{~mL}\) of water requires \({\text{1}}{\text{.47}}\,\,{\text{mg}}\) of \(\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\) (Mol. wt. \(\left.=294\right)\) for oxidation of dissolved organic matter. The C.O.D. of water is

1 \({\text{2}}{\text{.44}}\,\,{\text{ppm}}\)
2 \({\text{24}}\,\,{\text{ppm}}\)
3 \({\text{32}}\,\,{\text{ppm}}\)
4 \({\text{1}}{\text{.6}}\,\,{\text{ppm}}\)
CHXI14:ENVIRONMENTAL CHEMISTRY

318589 BOD is connected with:

1 Microbes and organic matter
2 Organic matter
3 Microbes
4 None of the above
CHXI14:ENVIRONMENTAL CHEMISTRY

318590 \(100 \mathrm{ml}\) of a sample of water requires \(0.98 \mathrm{mg}\) of \(\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\) (M.W. \(=294\) ) in presence of the \(\mathrm{H}_{2} \mathrm{SO}_{4}\) for the oxidation of dissolved orgamic matter in it. The C.O.D of the water sample is

1 \({\text{78}}{\text{.4}}\,\,{\text{ppm}}\)
2 \({\text{1}}{\text{.6}}\,\,{\text{ppm}}\)
3 \({\text{3}}{\text{.2}}{\mkern 1mu} \,{\mkern 1mu} {\text{ppm}}\)
4 \({\text{6}}{\text{.4}}\,\,{\text{ppm}}\)
CHXI14:ENVIRONMENTAL CHEMISTRY

318591 B.O.D values of four samples of water (i), (ii), (iii) and (iv) is given below
(i) \({\text{160}}\,\,{\text{ppm}}\)
(ii) \({\text{35}}\,\,{\text{ppm}}\)
(iii)\({\text{180}}\,\,{\text{ppm}}\)
(iv) \({\text{25}}\,\,{\text{ppm}}\)
The decreasing order of extent of pollution in water is

1 (iii) \(>\) (i) \(>\) (iv) \(>\) (ii)
2 (iv) \(>\) (ii) \(>\) (i) \(>\) (iii)
3 (iii) \(>\) (i) \(>\) (ii) \(>\) (iv)
4 (iv) \(>\) (i) \(>\) (ii) \(>\) (iii)