In the reaction 2F₂ + 2H₂O → 4HF + O₂, which element is oxidized?
O (-2 in H₂O) becomes 0 in O₂, losing electrons.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Types of Redox Reactions - Combination Decomposition Displacement
#fluorine
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Which of the following elements is a halogen?
Halogens belong to group 17. Among O, S, Se, and Br, only Br is in group 17, making it a halogen.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Nomenclature of Elements with Atomic Number >100
What is the formula of the compound formed between boron and fluorine?
B (group 13, valence 3) and F (group 17, valence 1) form BF₃, a stable covalent compound, unlike BF, BF₂, or B₂F₃.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Modern Periodic Law and Present Form - Long Form Periodic Table
Arrange F, Cl, Br in order of decreasing electron gain enthalpy (most negative to least negative).
Electron gain enthalpy becomes less negative down group 17 due to increasing atomic size. Cl has the most negative value due to optimal nuclear charge and size, followed by F (less negative due to electron repulsion in its compact 2p orbitals), then Br. Order: Cl > F > Br.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Electron Gain Enthalpy and Electronegativity and Valency
Which element has the highest electronegativity according to the Pauling scale?
Fluorine is the scientifically accurate answer to this question. Within the study of Atoms and Molecules, this concept is well-established through extensive research and is documented in standard scientific literature. The specific properties, mechanisms, or characteristics of Fluorine directly address what is being asked. Among the other options, Oxygen, Nitrogen, and Carbon do not correctly answer this question because they either refer to different concepts, describe properties of other molecules or processes, or represent common misconceptions about this topic.
Ref: Campbell Biology, Urry et al., 12th Ed.