Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R$
Assertion A : Hydrogen is an environment-friendly fuel
Reason R : Atomic number of hydrogen is 1 and it is a very light element
In the light of the above statements, choose the correct answer from the options given below
Assertion A : Hydrogen is an environment-friendly fuel
Reason R : Atomic number of hydrogen is 1 and it is a very light element
In the light of the above statements, choose the correct answer from the options given below
Show Hint
Hydrogen is environment-friendly because its combustion produces only water, making it a clean source of energy. The lightness and atomic number of hydrogen do not directly explain this property.
- Both $A$ and $R$ are true and $R$ is the correct explanation of $A$
- A is true but $R$ is false
- $A$ is false but $R$ is true
- Both $A$ and $R$ are true but $R$ is NOT the correct explanation of $A$
The Correct Option is D
Solution and Explanation
- Assertion (A): Hydrogen is considered an environment-friendly fuel because, when used as a fuel (for example, in fuel cells), it produces only water as a by-product, making it clean and non-polluting. Assertion A is true.
- Reason (R): The atomic number of hydrogen is indeed 1, and it is the lightest element in the periodic table. Reason R is true.
However, Reason R does not explain why hydrogen is environment-friendly. The reason behind hydrogen’s environment-friendliness is due to its clean combustion, not because of its atomic number or lightness.
Conclusion: The correct answer is 4.
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(A) \( 1s<2s<2p<3d<4s \)
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(D) \( 1s<2s<4s<3d \)
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Concepts Used:
Hydrocarbons - Classification
Types of Hydrocarbons:
Hydrocarbons are classified under the special heads as stated below:
Saturated hydrocarbons-
Those compounds where there is a single bond present between carbon atoms and are saturated with atoms of hydrogen are saturated hydrocarbons. They are the prime component of petroleum fuel. Carbon atoms bond themselves to as many hydrogen atoms as they can. They undergo the process of hybridization, and also, do not have double or triple bonds. The formula for alkanes which is the most common hydrocarbon is CnH2n+2. Saturated hydrocarbons have an akin molecular formula as hydrocarbons.
Unsaturated hydrocarbons-
Hydrocarbons comprise at least one double or triple bond between carbon atoms known as unsaturated hydrocarbons. Alkenes are organic compounds that comprise double bonds, whereas alkynes are triple bonded. Here, the situation is the opposite of saturated hydrocarbons as the carbon atoms don't bond themselves with as many hydrogen atoms as possible. When it comes to hydrogen atoms, they are unsaturated.
Aliphatic hydrocarbons-
The term denotes the hydrocarbons formed as a result of the chemical degradation of fats. Aliphatic hydrocarbons are generally chemical compounds. Their structure includes one or more hydrogen atoms which are replaced with a halogen. They are linked in chains in single, double, or triple bonds without any rings. Propane, butane, methane, and ethane serve as good examples of aliphatic hydrocarbons.
Aromatic hydrocarbons-
They are discriminated against because of the benzene rings present in them. They give away different types of aroma. These hydrocarbons comprise only hydrogen and carbon atoms. They are used extensively in fields of medicine, hygiene, and fashion.