Tag: strategies to control environmental pollution and green chemistry

Questions Related to strategies to control environmental pollution and green chemistry

Which of the following gas is used in bleaching of paper?

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

  1. Hydrogen peroxide

  2. Sulphur dioxide

  3. Methane

  4. None of the above

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Correct Option: A
Explanation:

Alkaline hydrogen peroxide is used as a strong bleaching agent due to the oxidation state of $-1$ in the compound.

Chlorofluorocarbons have been in use in refrigerators and air conditioners are proved to be unfriendly to the environment. Substitutes to these compounds which are friendly to the environment are:

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

  1. $CCl _2$

  2. $C{Cl} _3F$

  3. $CClF _2CClF _2$

  4. $CF _3CH _2F$

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Correct Option: D
Explanation:

The first three compounds are chlorofluoro carbons which are harmful to ozone and unfriendly to the environment. These are used in refrigerators. so a compound called $CF _3CH _2F$ was discovered, which is friendly to the environment and used in refrigerators.

The design, development and implementation of chemical products and process to reduce or eliminate the use and generation of substances hazardous to human health and environment is called ________ .

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

  1. Green Revolution

  2. Green Chemistry

  3. Environmental Chemistry

  4. Waste Management

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Correct Option: B
Explanation:

The design, development and implementation of chemical products and processes to reduce or eliminate the use and generation of substances hazardous to human health and environment, is called Green Chemistry.
Waste Management is all the activities and actions required to manage waste from its inception to its final disposal.
Environmental Chemistry is the scientific study of the chemical and biochemical phenomena that occur in natural places.
It should not be confused with Green Chemistry, which seeks to reduce potential pollution at its source.

Which of the following reaction occur when urea is added to soil as a fertilizer?

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

  1. $NH _{ 2 }CONH _{ 2 }\longrightarrow HNCO+NH _{ 3 }$

  2. $N{ H } _{ 2 }CON{ H } _{ 2 }+{ H } _{ 2 }O\longrightarrow 2N{ H } _{ 3 }+C{ O } _{ 2 }$

  3. $2NH _{ 2 }CONH _{ 2 }\longrightarrow H _{ 2 }NCONHCONH _{ 2 }+NH _{ 3 }$

  4. Both 1 and 2

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Correct Option: B
Explanation:

Urea is a major fertilizer used worldwide. It provides nitrogen to the soil by decomposing to ammonia and $CO _2$ when acted on by urease, an enzyme in soils. Then, ammonia is taken by the plants.


$N{ H } _{ 2 }CON{ H } _{ 2 }+{ H } _{ 2 }O\longrightarrow 2N{ H } _{ 3 }+C{ O } _{ 2 }$

Hence the correct option is B.