D. It has a layered structure that allows sheets to slide
Answer: Option D
Solution (By JKExamLibrary)
Graphite's carbon atoms are arranged in layers held together by weak van der Waals forces. Layers can slide over each other, reducing friction. It is stable at high temperatures, so used where oil would decompose.
Explanation:
Glass is an amorphous (non-crystalline) solid, sometimes called a supercooled liquid. It lacks long-range periodic order; atoms are arranged in a disordered network. It softens over a temperature range rather than having a sharp melting point. Common glass is soda-lime-silicate glass. Crystalline solids have sharp melting points and regular lattice structures (e.g., NaCl, quartz).
Explanation:
Electrochemical equivalent (Z) is mass deposited per unit charge. It depends on molar mass and number of electrons transferred (valency). Z = M/(nF). It differs for different substances. Current and time affect total charge but not Z.
Explanation:
Sodium has the electronic configuration [Ne]3s1. After losing one electron to form Na+, it achieves a highly stable noble gas configuration ([Ne]). Removing a second electron from this stable core requires an exceptionally large amount of energy. Thus, sodium has the highest second ionization energy among these elements.
No comments yet. Be the first to start the discussion!