Tag: smoke, dust and other air pollutants, acid rain

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

Which one of these is the heaviest known stable nuclide?

  1. $Pb^{208}$
  2. $Pb^{206}$
  3. $Pb^{210}$
  4. $Pb^{204}$
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

Which of them is used to remove hydrogen sulphide from water?

  1. Continuous chlorination

  2. Aeration

  3. Heating

  4. Hydrodesulfurization
Reveal answer Fill a bubble to check yourself
A,B Correct answer
Explanation
Removal of $H _2S$ from water can be done by:
(I) Chlorination and filteration.
(ii) Manganese greensand iron filter.
(iii) Aeration.
(iv) Alternative systems.
Multiple choice chemistry air and water pollution control smoke, dust and other air pollutants, acid rain air pollutants and its effects air and air pollution

Which of the organs are most susceptible to hydrogen sulphide?

  1. Lungs

  2. Brain

  3. Eyes

  4. Legs
Reveal answer Fill a bubble to check yourself
A,B,C Correct answer
Explanation

Almost all organ systems are affected by hydrogen sulfide, but the most susceptible are those with exposed mucous membranes (e.g., eyes,  noise and throat) and those with high oxygen demands (e.g., lungs, brain).

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

What is the smell of hydrogen sulphide at a concentration of 200 ppm?

  1. Pleasant odour

  2. Rotten egg odour

  3. No smell

  4. Rotten fish smell
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

  At higher concentrations, hydrogen sulfide rapidly deadens the sense of smell which means the ability to sense the smell of anything will be no more at such high temperature.  For most people, this occurs at approximately $150ppm$. The gas has a characteristic rotten egg odour at low concentrations. About half of the population can smell it at concentrations as low as 8 parts per billion ($ppb$) in the air.


Hence, the correct option is C.

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

Which of the following is a characteristic of hydrogen sulphide?

  1. Poisonous

  2. Flammable

  3. Explosive

  4. Pleasant smell
Reveal answer Fill a bubble to check yourself
A,B,C Correct answer
Explanation

Hydrogen sulfide is the chemical compound with the formula $H _2S$. It is a colorless gas with the characteristic foul odor of rotten eggs; it is heavier than air, very poisonous, corrosive, flammable, and explosive.

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

What is released when hydrogen sulphide burns in oxygen?

  1. Hydrogen gas

  2. Water

  3. Sulphur trioxide

  4. Sulphur dioxide
Reveal answer Fill a bubble to check yourself
B,D Correct answer
Explanation

$2H _2S+3O _2\longrightarrow \underbrace {2SO _2} _{sulphur\quad dioxide}+\underbrace {2H _2O} _{water}$

When hydrogen sulphide burns in oxygen, formation of sulphur dioxide and water takes place.

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

HF is stored in which container?

  1. Tin container

  2. Borosilicate glass

  3. Plastic bottle

  4. Stainless steel container
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Because of its high reactivity toward glass and moderate reactivity toward many metals, hydrofluoric acid is usually stored in plastic containers (although PTFE is slightly permeable to it).

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

What is concentration of hydrogen sulphide when inhaled will be safe?

  1. 10 ppm

  2. 100ppm

  3. 1000 ppm

  4. 2000 ppm
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

For hydrogen sulfide, it is allowable for workers to be exposed to concentrations of 10 parts per million, averaged over an eight-hour work shift, with the exposure not exceeding 15 parts per million. 
1000ppm and 2000ppm have high probability of death and lose consciousness.

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

 Which one of these is a neurotoxin that accumulates both in soft tissues and the bones, damaging the nervous system and causing brain disorders?

  1. Mg

  2. Na

  3. K

  4. Pb
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Lead is a neurotoxin that accumulates both in soft tissues and the bones, damaging the nervous system and causing brain disorders.