Tag: chemistry

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Questions Related to chemistry

Multiple choice chemistry environmental chemistry biochemistry and the environment green chemistry strategies to control environmental pollution and green chemistry

Which of the following compounds are toxic?

  1. Benzene

  2. Toluene

  3. Carbon tetrachloride

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A toxic substance is a substance that can be poisonous or cause health effects.

Benzene is known to cause cancer, based on evidence from studies in both people and lab animals.Basically it is carcinogenic.
Toluene is irritating to the skin, eyes, and respiratory tract. It can cause systemic toxicity by ingestion or inhalation and is slowly absorbed through the skin.
Carbon tetrachloride is one of the most potent hepatotoxins (toxic to the liver), so much so that is widely used in scientific research to evaluate hepatoprotective agents.Exposure to high concentrations of carbon tetrachloride (including vapour) can affect the central nervous system, degenerate the liver and kidneys and prolonged exposure may lead to coma or death.

Multiple choice chemistry environmental chemistry biochemistry and the environment green chemistry strategies to control environmental pollution and green chemistry

________ reduces toxicity, minimizes waste, saves energy, and cuts down on the depletion of natural resources. It allows for advances in chemistry to occur in a much more environmentally benign way.

  1. Green chemistry

  2. Green revolution

  3. Waste management

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Green chemistry seeks to develop products and processes that are kind to the environment. This can involve reducing the waste a process creates, using renewable materials, lessening the energy required to form a product, etc. 

Multiple choice chemistry environmental chemistry biochemistry and the environment green chemistry strategies to control environmental pollution and green chemistry

Faraday has developed a plating process to make high-performance chrome coatings from trivalent chromium instead of highly toxic hexavalent chromium. This is an application of:

  1. Green revolution

  2. Green chemistry

  3. waste management

  4. revolution resource recovery
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Faraday has developed a plating process to make high-performance chrome coatings from trivalent chromium instead of highly toxic hexavalent chromium. It involves the production of alternate product which is more friendly to environment. Hence, this is an application of Green chemistry.

Multiple choice chemistry environmental chemistry biochemistry and the environment green chemistry strategies to control environmental pollution and green chemistry

The process of nutrient enrichment is termed as:

  1. Limiting nutrients

  2. Eutrophication

  3. Enrichment

  4. Schistosomiasis
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Eutrophication is a very slow process in which river, lake or another shallow water source deteriorate in the marsh and later on dies. Nutritive pollution is one of the important factor of eutrophication due to which aquatic plant and animal life of this water destroed. Or e can say that excessive richness of nutrients in a lake or other body of water, frequently due to run-off from the land, which causes a dense growth of plant lifeis known as eutrophication.
Multiple choice chemistry environmental chemistry biochemistry and the environment green chemistry strategies to control environmental pollution and green chemistry

Green chemistry means such reactions which -

  1. are related to the depletion of ozone layer

  2. study the reactions in plants

  3. produce colour during reactions

  4. reduce the use and production of hazardous

    chemicals
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Green chemistry means chemistry that uses less harmful and hazardous chemicals products that does not cause any harm neither to us nor to the environment.

Multiple choice chemistry environmental chemistry biochemistry and the environment green chemistry strategies to control environmental pollution and green chemistry

Which of the following method of separation is done with the help of bullocks?

  1. Threshing

  2. handpicking

  3. winnowing

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

Threshing is the process of loosening the edible part of grain (or other crop) from the husks and straw to which it is attached. It is the step in grain preparation after reaping and before winnowing, which separates the grain from the chaff.

Multiple choice chemistry environmental chemistry biochemistry and the environment green chemistry strategies to control environmental pollution and green chemistry

Green chemistry involves ?

  1. production of chemicals of our daily use from green house gases

  2. such chemical processes in which green plants are used

  3. those reaction which are of biological origin

  4. use of non-toxic reagents and solvents to produce environment friendly products.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Green chemistry is a design of products and process that reduces or eliminates the use of harmful hazardous products. It uses the concept of invention and design and invokes to produce products that are environment-friendly.

Multiple choice chemistry environmental chemistry biochemistry and the environment green chemistry strategies to control environmental pollution and green chemistry

Soil is a natural medium for growth of land plants. Organic soil contains organic number upto a depth of

  1. Two and a half feet

  2. One foot

  3. Six inches

  4. Ten feet
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Organic soil contain organic number upto a depth of two and half feet, this is also known as human or upper layer of soil.

Multiple choice chemistry environmental chemistry biochemistry and the environment green chemistry strategies to control environmental pollution and green chemistry

Which of the following method of separation is used to separate heavier and lighter components of a mixture by wind or by blowing air?

  1. winnowing

  2. handpicking

  3. threshing

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

The method of separation that is used to separate heavier and lighter components of a mixture by wind or by blowing air is winnowing.