Tag: air and water pollution control

Questions Related to air and water pollution control

What is the odour of $H _2S$?

chemistry air and water pollution control smoke, dust and other air pollutants, acid rain air pollutants and its effects air and air pollution

  1. Rotten fish

  2. Rotten egg

  3. Pungent

  4. Rotten cabbage

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Correct Option: B
Explanation:

Hydrogen sulfide is the chemical compound with the formula $H _2S$. It is a colorless chalcogen hydride gas with the characteristic foul odor of rotten eggs. It is very poisonous, corrosive, and flammable.

Option (B) is the answer.

What happens during heating of hydrogen sulphide?

chemistry air and water pollution control smoke, dust and other air pollutants, acid rain air pollutants and its effects air and air pollution

  1. Produce toxic gases

  2. Combustion

  3. Dissociate

  4. None of above

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Correct Option: A,B
Explanation:

$H _2S$ gas burns producing toxic gases such as $SO _2$. $H _2S$ is flammable, hence combustible.

At which concentration (in ppm), do we lose the rotten egg smell of hydrogen sulphide?

chemistry air and water pollution control smoke, dust and other air pollutants, acid rain air pollutants and its effects air and air pollution

  1. 50

  2. 100

  3. 150

  4. 80

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Correct Option: B
Explanation:

Above 100 ppm we can lose the rotten smell of hydrogen sulphide.

Which gas on exposure to high concentrations can cause unconsciousness, known as "knockdown," which can be lethal?

chemistry air and water pollution control smoke, dust and other air pollutants, acid rain air pollutants and its effects air and air pollution

  1. Hydrogen sulphide

  2. Galena

  3. carbon-monoxide

  4. none of these

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Correct Option: A
Explanation:

$H _2S$ being toxic causes a wide range of health hazards such as nausea, tearing of eyes, headache or loss of sleep or bronchial problems in some asthma patients; acute exposure causes rapid unconsciousness,' knockdown ' or immediate collapse, death within minutes.

Hence, option $A$ is correct.

What are the effects of long-term exposure to hydrogen sulphide?

chemistry air and water pollution control smoke, dust and other air pollutants, acid rain air pollutants and its effects air and air pollution

  1. Respiratory soft tissue damage

  2. Memory loss

  3. Prolonged reaction time

  4. None of above

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Correct Option: A,B,C

$HCN$ is toxic because $CN^-$ binds to iron in which subunit of cytochromes?

chemistry air and water pollution control smoke, dust and other air pollutants, acid rain air pollutants and its effects air and air pollution

  1. Meth

  2. Heme

  3. Lysosomes

  4. Cyt-a

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Correct Option: B

What is minimum parts per million concentration hydrogen sulfide when inhaled can lead to immediate collapse and unconsciousness?

chemistry air and water pollution control smoke, dust and other air pollutants, acid rain air pollutants and its effects air and air pollution

  1. 10

  2. 20

  3. 30

  4. 500

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Correct Option: D
Explanation:

$500$ ppm of $H _2S$ can cause staggering and collapse in $5$ minutes. 

Which gas has a high risk of health effects during its release in industries using oil or natural gas?

chemistry air and water pollution control smoke, dust and other air pollutants, acid rain air pollutants and its effects air and air pollution

  1. Galena

  2. Carbon monoxide

  3. Hydrogen sulfide

  4. None of these

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Correct Option: C
Explanation:

$H _2S$ has high risk of health hazards; such as nausea, hearing of eyes, headache or loss of sleep or bronchial problem in some asthama patients; acute exposure causes rapid unconsciousness, 'knockdown' or immediate collapse, death within minutes. 

Which one of these are known as prussic acid?

chemistry air and water pollution control smoke, dust and other air pollutants, acid rain air pollutants and its effects air and air pollution

  1. $HCN$

  2. $HF$

  3. $NH _3$

  4. $PH _3$

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Correct Option: A
Explanation:

Hydrogen cyanide $(HCN)$, sometimes called prussic acid, is a chemical compound with the chemical formula $HCN$. 

It is colourless, extremely poisonous and flammable liquid that boils slightly above room temperature. $HCN$ is produced on an industrial scale and is a highly valuable precursor to many chemical compounds ranging from polymers to pharmaceuticals.

Which one of these is the heaviest known stable nuclide?

chemistry air and water pollution control smoke, dust and other air pollutants, acid rain air pollutants and its effects air and air pollution

  1. $Pb^{208}$

  2. $Pb^{206}$

  3. $Pb^{210}$

  4. $Pb^{204}$

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Correct Option: A
Explanation:

Lead's four stable isotopes each have 82 protons, a magic number in the nuclear shell model of atomic nuclei. The isotope lead-208 also has 126 neutrons, another magic number, and is hence double magic, a property that grants it enhanced stability: lead-208 is the heaviest known stable nuclide.