Given below are two statements:
Statement I: Like nitrogen that can form ammonia, arsenic can form arsine.
Statement II: Antimony cannot form antimony pentoxide.
In the light of the above statements, choose the most appropriate answer from the options given below:
Correct Answer :
Statement I is correct but Statement II is incorrect.
Solution :
The correct option is: Statement I is correct but Statement II is incorrect.
Let us analyze both statements step-by-step to understand the underlying chemistry:
Analysis of Statement I:
Nitrogen () and arsenic () belong to Group 15 of the periodic table. Elements of this group form stable trihydrides of the general formula . Just like nitrogen forms ammonia () by reacting with hydrogen, arsenic forms arsine (). Both are toxic/flammable gases with similar pyramidal geometries. Therefore, Statement I is correct.
Analysis of Statement II:
Antimony () can form oxides in both its +3 and +5 oxidation states. Specifically, antimony reacts to form antimony pentoxide () when treated with strong oxidizing agents like concentrated nitric acid. Since antimony can indeed form antimony pentoxide, the statement asserting that it cannot do so is incorrect. Therefore, Statement II is incorrect.
Conclusion: Statement I is correct but Statement II is incorrect.
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