The incorrect statement about carbon monoxide is-
1. | It reduces the oxygen-carrying ability of blood. |
2. | The carboxyhaemoglobin (haemoglobin bound to CO) is less stable than oxyhaemoglobin. |
3. | It is produced due to incomplete combustion. |
4. | It forms carboxyhaemoglobin. |
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‘White lung cancer’ is caused by :
1. Asbestos
2. Silica
3. Textiles
4. Paper
Incorrect statement among the following is:
1. Oxides of sulphur, nitrogen, and carbon are the most widespread air pollutant.
2. pH of drinking water should be between 6.5 and 8.5.
3. Concentration of dissolved oxygen below 6 ppm is good for the growth of fish.
4. Clean water would have a BOD value of less than 5 ppm.
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The aromatic compound that is present as particulate among the following is :
1. Benzene
2. Toulene
3. Nitrobenzene
4. Polycyclic hydrocarbons
The oxygen present today in the atmosphere-
1. Is a plant product.
2. Came from ozone.
3. Was present in the beginning.
4. Is produced by carbon dioxide.
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Living in the atmosphere of CO is dangerous because it :
1. Combines with O2 present inside to form CO2
2. Reduces organic matter of tissues.
3. Combines with haemoglobin and makes it incapable to absorb oxygen.
4. Dilutes the blood.
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Biochemical oxygen Demand value less than 5 ppm indicates a water sample to be :
1. Highly polluted.
2. Poor in dissolved oxygen.
3. Rich in dissolved oxygen.
4. Not suitable for aquatic life.
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The chemical that is an excellent ‘green’ solvent as well as a greenhouse gas is:
1. Methanol
2. CFCs
3. Carbon monoxide
4. Carbon Dioxide
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Which, of the following, gases contributes nearly 50 % to the green house effect (which, in turn, causes global warming) ?
1. SO2
2. SO3
3. CO2
4. Water vapour
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Ozone is a very toxic gas and a strong oxidizing agent. It is still useful for life on earth :
1. because it traps harmful UV-rays.
2. because it balances global warming.
3. because it traps harmful X-rays.
4. because it traps harmful -rays.
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