Allotropic form of phosphorus that is poisonous is
Correct answer: A. White
- A. White
- B. Red phosphorus
- C. Black phosphorus
- D. Violet phosphorus
Explanation
White phosphorus is the most toxic and reactive allotrope of phosphorus. It's a waxy, yellowish-white solid that spontaneously ignites in air and emits a garlic-like odor. It's highly poisonous and can cause severe burns, organ damage, and even death if ingested or absorbed through the skin.Equations:White phosphorus reacting with air (combustion):4P (white) + 5O2 → 2P2O5 (diphosphorus pentoxide)Red phosphorus reacting with air (slow oxidation):P (red) + O2 → P4O10 (tetraphosphorus decaoxide)Black phosphorus doesn't react with air under normal conditions.
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About s-Block and p-Block Elements
The s and p blocks are studied through their valence-shell configurations, periodic trends and characteristic chemical properties. Work covers the reactions of Group I and Group II elements, the behaviour of Group IV elements, and how atomic size, ionization energy, electronegativity and metallic character change across periods and down groups.
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