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An ionic bond involves electron transfer, as seen in NaCl , where sodium donates an electron to chlorine.
Ref: NCERT Class 11 Chemistry > Chapter 4: Chemical Bonding and Molecular Structure > Topic: Ionic Bonding - Lattice Enthalpy and Properties of Ionic Compounds
Covalent bond is the accurate classification or categorization for the organism, molecule, or concept described in this question. In Atoms and Molecules, proper classification is based on shared characteristics including morphological, biochemical, genetic, and evolutionary criteria. Covalent bond meets the specific diagnostic features and defining criteria that distinguish it from related groups. The other options (Hydrogen bond, Van der Waals forces, and Ionic bond) belong to different taxonomic groups, represent different classification levels, or possess distinct characteristics that exclude them from this category.
Ref: Campbell Biology, Urry et al., 12th Ed.
Energy decreases correctly describes the effect or change asked about in this question. In Chemical Bonding, understanding cause-and-effect relationships is essential for predicting biological outcomes. Energy decreases occurs because of specific molecular interactions, thermodynamic principles, or regulatory mechanisms that govern this biological process. The other options (Energy increases, No change, and Becomes zero) describe either opposite effects, effects that occur under different conditions, or changes associated with unrelated processes.
Ref: Campbell Biology, Urry et al., 12th Ed.
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