Tag: chemistry

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

Major constituent of LPG is:

  1. ethene

  2. butane

  3. propane

  4. pentane
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Liquefied petroleum gas or liquid petroleum gas (LPG or LP gas), also referred to as simply propane or butane, are flammable mixtures of hydrocarbon gases used as fuel in heating appliances, cooking equipment, and vehicles. The percentage of butane is around 70% and that of propane is around 30%.

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

L.P.G. is a hydrocarbon consisting of a mixture of:

  1. methane and butane

  2. propane and butane

  3. ethane and propane

  4. ethane and butane
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Liquefied petroleum gas or liquid petroleum gas (LPG or LP gas), also referred to as simply propane or butane, are flammable mixtures of hydrocarbon gases used as fuel in heating appliances, cooking equipment, and vehicles. The percentage of butane is around 70% and that of propane is around 30%.

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

Choose the correct statement.

  1. Hydro and wind energy plants are non-polluting sources of energy

  2. There is infinite storage of fossil fuel inside the earth

  3. Sun can be taken as an inexhaustible source of energy

  4. Waste from a nuclear power plant can be easily disposed off
Reveal answer Fill a bubble to check yourself
A,C Correct answer
Explanation

Hydro and wind energy plants are non-polluting sources of energy as they do not emit any kind of harmful substances.

Sun can be taken as an inexhaustible source of energy.

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

The power generated in a windmill: 

  1. is more in rainy season since damp air would mean more air mass hitting the blades

  2. can be increased by planting tall trees close to the tower

  3. depends on the height of the tower

  4. depends on wind velocity
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Power generated in a windmill depends on the velocity of the wind. More is the velocity $\longrightarrow$ more will be the velocity of the windmills thereby generating more power.

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

____________ contribute to sewer gas hazards.

  1. Improper disposal of petroleum products

  2. Only gasoline

  3. Only mineral spirits

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

Sewer gases may include hydrogen sulphide, ammonia, $CO,SO _2,NO$, etc. Improper disposal of petroleum products such as gasoline and mineral gas spirits contribute to sewer gas hazards.

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

The residue from biogas plant serves as _______manure.

  1. inorganic

  2. organic

  3. synthetic

  4. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Biogas is produced by anaerobic degradation of biological materials such as food wastes, animal and plant wastes. Biogas is produced when organic matter decomposes without oxygen in a process which is called anaerobic decomposition. Biogas consists mainly of methane, carbon dioxide and small amounts of impurities/residues.

So the residue from biogas plant serves as organic manure.

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

The nuclear reaction-
${ _{ 1 }^{ 2 }{ H } } +{ _{ 1 }^{ 2 }{ H } } _{  }\longrightarrow { _{ 2 }^{ 4 }{ He } }$ is called:

  1. fission reaction

  2. fusion reaction

  3. chain reaction

  4. thermal reaction
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Nuclear fusion is a process where two or more nuclei combine to form an element with a higher atomic number (more protons in the nucleus). Fusion is the reverse process of nuclear fission.

The nuclear reaction -
${ _{ 1 }^{ 2 }{ H } } +{ _{ 1 }^{ 2 }{ H } } _{  }\longrightarrow { _{ 2 }^{ 4 }{ He } }$ is fusion reaction because two nuclei combine to form an element with higher atomic number.During this process, 0.7% of the mass is carried away from the system in the form of kinetic energy.
So the answer is B.

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

The main component of Bio gas is ___________.

  1. Methane

  2. Benzene

  3. Ethylene

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

The main component of bio gas is methane.
Methane is also the important constituent (95%) of natural gas. Methane has high heat of combustion. Hence, it is used as fuel.
$CH _4 + 2O _2 \rightarrow CO _2 + 2H _2O + heat$

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

Why are metal pipes not an ideal means of transport for pure hydrogen?

  1. They become brittle

  2. They burst out

  3. The metals melt

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

Pure hydrogen is the smallest element and some of it will inevitably escape from any known container or pipe in micro amounts. It causes the metal to become brittle, suggesting metal pipes may not be ideal for hydrogen transport.