Which of the following will give phosphoric acid on reaction with water
Correct answer: D. All of the above
- A. PCl3 (phosphorus trichloride)
- B. P2O3 (diphosphorus trioxide)
- C. P2O5 (diphosphorus pentoxide)
- D. All of the above
Explanation
(a) PCl3 (phosphorus trichloride): Although PCl3 does liberate hydrochloric acid (HCl) alongside phosphoric acid as a byproduct, the question only asks for phosphoric acid formation as a result of its reaction with water. Therefore, even with the additional product, PCl3 fits the criteria.(b) P2O3 (diphosphorus trioxide): While P2O3 reacts with water to produce a mixture of phosphoric and phosphorous acids, it still generates phosphoric acid, satisfying the question's requirement. The presence of another acid doesn't disqualify it as an option that gives phosphoric acid upon reaction with water.(c) P2O5 (diphosphorus pentoxide): As previously mentioned, P2O5 reacts with water to exclusively form phosphoric acid, making it a clear contender for the answer.Incorrect option:There are actually no incorrect options in this case.Therefore, while option (c) provides the sole product of phosphoric acid, both (a) and (b) still fulfil the requirement of generating phosphoric acid through their reaction with water, leading to (d) "All of the above" being the most comprehensive and accurate answer.
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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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