The number of atoms in a molecule of phosphorus (P₄) is:
A. 8
B. 4
C. 1
D. 2
Answer: Option B
Solution (By JKExamLibrary)
White phosphorus exists as P₄ tetrahedral molecules, containing 4 phosphorus atoms. So atomicity is 4. Sulfur is S₈, oxygen is O₂, ozone O₃. Atomicity is the number of atoms in a molecule of an element. Phosphorus is a non-metal. Red phosphorus is polymeric but P₄ is the common molecular form.
Explanation:
Difference in pH = 3. Each pH unit is a 10-fold change in [H⁺]. So 10³ = 1000 times more acidic. [H⁺] at pH 1 = 10⁻¹ M, at pH 4 = 10⁻⁴ M. Ratio = 10⁻¹ / 10⁻⁴ = 10³ = 1000. pH scale is logarithmic; small changes mean large concentration differences.
Explanation:
Sodium hydroxide (NaOH) has ionic bond between Na⁺ and OH⁻, and covalent bond between O and H within OH⁻. NaCl is purely ionic; CH₄ and HCl are purely covalent (polar covalent in HCl, but not ionic).
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