Which of the following statements are NOT correct?
A. Hydrogen is used to reduce heavy metal oxides to metals.
B. Heavy water is used to study reaction mechanism.
C. Hydrogen is used to make saturated fats from oils.
D. The H-H bond dissociation enthalpy is lowest as compared to a single bond between two atoms of any element.
E. Hydrogen reduces oxides of metals that are more active than iron.
Choose the most appropriate answer from the options given below :
A. Hydrogen is used to reduce heavy metal oxides to metals.
B. Heavy water is used to study reaction mechanism.
C. Hydrogen is used to make saturated fats from oils.
D. The H-H bond dissociation enthalpy is lowest as compared to a single bond between two atoms of any element.
E. Hydrogen reduces oxides of metals that are more active than iron.
Choose the most appropriate answer from the options given below :
B, D only
D, E only
A, B, C only
B, C, D, E only
The Correct Option is B
Solution and Explanation
A. Hydrogen is used to reduce heavy metal oxides to metals. - This statement is correct. Hydrogen gas is often used as a reducing agent in metallurgical processes to convert metal oxides to their respective metals.
B. Heavy water is used to study reaction mechanisms. - This statement is incorrect. Heavy water (D2O) is used to study the effects of isotopic substitution but is not typically used to study reaction mechanisms.
C. Hydrogen is used to make saturated fats from oils. - This statement is incorrect. Hydrogenation of oils involves the addition of hydrogen to unsaturated fats to produce saturated fats. However, a catalyst (such as nickel or platinum) is typically used in this process, not hydrogen gas itself.
D. The H-H bond dissociation enthalpy is lowest as compared to a single bond between two atoms of any element. - This statement is correct. The H-H bond dissociation enthalpy is the lowest among the diatomic molecules.
E. Hydrogen reduces oxides of metals that are more active than iron. - This statement is incorrect. Hydrogen gas is not commonly used to reduce metal oxides that are more active than iron. Other reducing agents, such as carbon or carbon monoxide, are typically used for this purpose.
Therefore, the incorrect statements are B and E, making option (B) D, E only the correct answer.
Top Questions on Hydrogen
Questions Asked in NEET exam
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Assertion A : The potential (V) at any axial point, at 2 m distance(r) from the centre of the dipole of dipole moment vector \(\vec{P}\) of magnitude, 4 × 10-6 C m, is ± 9 × 103 V.
(Take \(\frac{1}{4\pi\epsilon_0}=9\times10^9\) SI units)
Reason R : \(V=±\frac{2P}{4\pi \epsilon_0r^2}\), where r is the distance of any axial point, situated at 2 m from the centre of the dipole.
In the light of the above statements, choose the correct answer from the options given below :- NEET (UG) - 2024
- Magnetic Field
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Statement I: Mitochondria and chloroplasts both double membranes bound organelles.
Statement II: Inner membrane of mitochondria is relatively less permeable, as compared chloroplast. I
In the light of the above statements, choose the mis appropriate answer from the options given below- NEET (UG) - 2024
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- Match List I with List II:Choose the correct answer from the options given below:
List I
List II
A Mesozoic Era I Lower invertebrates B Proterozoic Era II Fish & Amphibia C Cenozoic Era III Birds & Reptiles D Paleozoic Era IV Mammals - NEET (UG) - 2024
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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.