Tag: chemistry

Questions Related to chemistry

Which of the following measures can help in controlling hydro carbon pollution

chemistry occurrence of carbon compounds in nature substances, objects and energy alternative fuels and energy sources alternative sources of energy

  1. Less usage of automobile

  2. controlling population

  3. A,B

  4. Nne

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Correct Option: C
Explanation:

Less usage of automobiles and controlling population he following measures can help in controlling hydro carbon pollution
Hence option C is the correct answer.

Hydrogen is a cleaner fuel than $CNG.$ 

chemistry occurrence of carbon compounds in nature substances, objects and energy alternative fuels and energy sources alternative sources of energy

  1. True

  2. False

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Correct Option: A
Explanation:

Hydrogen gas is cleaner fuel than $CNG$ as $CNG$ contains hydrocarbons which in turn contains carbon and it is a form of pollutant present in $CNG.$  But hydrogen is waste-free. The fusion of hydrogen does not produce any waste and therefore it is cleaner than $CNG.$

The medium which retains and interacts with a pollutant is:

chemistry occurrence of carbon compounds in nature substances, objects and energy alternative fuels and energy sources alternative sources of energy

  1. receptor

  2. sink

  3. both $A$ and $B$

  4. system

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Correct Option: B
Explanation:

Sink acts as a medium which retains and interacts with a pollutant.

Biofuels are different from fossil fuels in regard to greenhouse gases but are similar to fossil fuels in that biofuels contribute to air pollution

chemistry occurrence of carbon compounds in nature substances, objects and energy alternative fuels and energy sources alternative sources of energy

  1. True

  2. False

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Correct Option: A
Explanation:

Fuels extracted from plants and crops are known as biofuels. They not only help a struggling economy by providing jobs but also helps in reducing greenhouse gases up to much extent by emitting less pollution. 

Biofuels are produced from wheat, corn, soybean, and sugarcane which can be produced again and again and thus they are sustainable.
Like fossil fuel, biofuel also causes air pollution.

A liquid fuel used in homes is:

chemistry occurrence of carbon compounds in nature substances, objects and energy alternative fuels and energy sources alternative sources of energy

  1. Water

  2. LPG

  3. CNG

  4. Cooking oil

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Correct Option: D
Explanation:

Cooking oil or Vegetable oil can be used as an alternative fuel in diesel engines and in heating oil burners. When vegetable oil is used directly as a fuel, in either modified or unmodified equipment, it is referred to as straight vegetable oil (SVO) or pure plant oil (PPO). Conventional diesel engines can be modified to help ensure that the viscosity of the vegetable oil is low enough to allow proper atomization of the fuel. This prevents incomplete combustion, which would damage the engine by causing a build-up of carbon. Straight vegetable oil can also be blended with conventional diesel or processed into biodiesel or bioliquids for use under a wider range of conditions.

Hence, the correct option is $D$

Biomass can be converted into fuels by:

chemistry occurrence of carbon compounds in nature substances, objects and energy alternative fuels and energy sources alternative sources of energy

  1. thermal conversion

  2. biochemical conversion

  3. chemical conversion

  4. all of the above

Show answer
Correct Option: D
Explanation:

Biomass is an organic material that comes from plants and animals and it is a renewable source of energy.

This biomass can be converted into fuels by thermal conversion, biochemical conversion, and chemical conversion as well.

Which is the ultimate source of energy? 

chemistry occurrence of carbon compounds in nature substances, objects and energy alternative fuels and energy sources alternative sources of energy

  1. Sun

  2. Uranium

  3. Fossil fuels

  4. Water

Show answer
Correct Option: A
Explanation:

The ultimate source of energy is Sun because it is continuously providing us with energy and is the source of all other energies like light energy, heat energy, etc.

In a hydropower plant :

chemistry occurrence of carbon compounds in nature substances, objects and energy alternative fuels and energy sources alternative sources of energy

  1. electricity is extracted from water

  2. water is converted into steam to produce electricity

  3. potential energy possessed by stored water is converted into electricity

  4. kinetic energy possessed by stored water is converted into potential energy

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Correct Option: C
Explanation:

In hydropower plant, the potential energy possessed by the stored water is converted into electricity with help of a turbine of an electric generator.

A biofuel is produced by:

chemistry occurrence of carbon compounds in nature substances, objects and energy alternative fuels and energy sources alternative sources of energy

  1. agricultural digestion

  2. anaerobic digestion

  3. geological process

  4. all of the above

Show answer
Correct Option: A,B
Explanation:

$\Rightarrow$  Bio-fuels are designed to replace gasoline, diesel fuel and coal, which are called “fossil fuels” because they are made from animals and plants that died millions of years ago. 

$\Rightarrow$  Bio-fuels are made mostly from plants that have just been harvested.
$\Rightarrow$  A Bio-fuel is produced by: $Agriculture\,digestion$ and $Anaerobic\,digestion$.

Identify from the following a conventional source of energy.

chemistry occurrence of carbon compounds in nature substances, objects and energy alternative fuels and energy sources alternative sources of energy

  1. Solar Energy

  2. Tidal Energy

  3. Natural Gas

  4. Bio Energy

Show answer
Correct Option: C
Explanation:

Conventional energy directly mean the energy source which is fixed in nature like oil, gas and coal. In other words conventional energy is also termed as non-renewable energy sources. Their use leads to increased greenhouse gas emissions and other environmental damage. Natural gas is a fossil fuel used as a source of energy for heating, cooking, and electricity generation. It is also used as fuel for vehicles and as a chemical feedstock in the manufacture of plastics and other commercially important organic chemicals. It is a non-renewable resource.