Phosphorus (white) catches fire in air and burns with the formation of white smoke the product formed is:
Correct answer: D. Both (A) & (B)
- A. Phosphoruss (iii) oxide
- B. Phosphoruss (v) oxide
- C. Phosphorus (ii) oxide
- D. Both (A) & (B)
Explanation
When white phosphorus burns in air, it undergoes a slow combustion reaction to form phosphorus (I) oxide, which is also known as phosphorus monoxide or phosphorus(I) oxide. This compound has the chemical formula P2O and is a white crystalline solid that sublimes at high temperatures. The balanced chemical equation for the reaction is:4P (s) + 5O2 (g) → 2P2O (s)In addition to phosphorus (I) oxide, white phosphorus also reacts with oxygen to form phosphorus (V) oxide, which is also known as phosphorus pentoxide or phosphoric anhydride. This compound has the chemical formula P4O10 and is a white crystalline solid that is highly hygroscopic. The balanced chemical equation for the reaction is:P4 (s) + 5O2 (g) → P4O10 (s)Therefore, the correct answer to the question is option D) Both (A) & (B).
This question appeared on the ETEA MDCAT 2017 paper, which you can sit online with every answer explained.
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