Given below are two statements:
Statement I: All the pairs of molecules \((\mathrm{PbO}, \mathrm{PbO_2}); (\mathrm{SnO}, \mathrm{SnO_2})\) and \((\mathrm{GeO}, \mathrm{GeO_2})\) contain amphoteric oxides.
Statement II: \(\mathrm{AlCl_3}, \mathrm{BH_3}, \mathrm{BeH_2}\) and \(\mathrm{NO_2}\) all have incomplete octet.
In the light of the above statements, choose the correct option.
Given below are two statements:
Statement I: All the pairs of molecules \((\mathrm{PbO}, \mathrm{PbO_2}); (\mathrm{SnO}, \mathrm{SnO_2})\) and \((\mathrm{GeO}, \mathrm{GeO_2})\) contain amphoteric oxides.
Statement II: \(\mathrm{AlCl_3}, \mathrm{BH_3}, \mathrm{BeH_2}\) and \(\mathrm{NO_2}\) all have incomplete octet.
In the light of the above statements, choose the correct option.
Show Hint
Lower oxides of heavier group 14 elements are often amphoteric
Higher oxides tend to be acidic
Electron-deficient molecules violate the octet rule
- Both Statement I and Statement II are correct
- Both Statement I and Statement II are incorrect
- Statement I is correct but Statement II is incorrect
- Statement I is incorrect but Statement II is correct
The Correct Option is D
Solution and Explanation
Let's analyze each statement given in the question:
- Statement I: All the pairs of molecules \((\mathrm{PbO}, \mathrm{PbO_2}); (\mathrm{SnO}, \mathrm{SnO_2})\) and \((\mathrm{GeO}, \mathrm{GeO_2})\) contain amphoteric oxides.
- Amphoteric oxides can react with both acids and bases to form salt and water. Hence, they have the ability to exhibit both acidic and basic properties.
- \(\mathrm{PbO}\) and \(\mathrm{SnO}\) are indeed amphoteric. However, \(\mathrm{PB0_2}\) and \(\mathrm{SnO_2}\) are generally considered as more acidic oxides rather than amphoteric. Similarly, \(\mathrm{GeO}\) is basic, while \(\mathrm{GeO_2}\) is typically acidic.
- Thus, the statement that all specified oxides in each pair are amphoteric is incorrect.
- Statement II: \(\mathrm{AlCl_3}, \mathrm{BH_3}, \mathrm{BeH_2}\) and \(\mathrm{NO_2}\) all have incomplete octet.
- The term "incomplete octet" refers to molecules in which the central atom possesses fewer than eight electrons in its valence shell.
- \(\mathrm{AlCl_3}\), \(\mathrm{BH_3}\), and \(\mathrm{BeH_2}\) are classic examples of compounds with an incomplete octet, as they have six, six, and four electrons respectively in their outermost shell.
- \(\mathrm{NO_2}\) also manifests an odd number of valence electrons, leading to an incomplete octet for the nitrogen atom. Hence, \(\mathrm{NO_2}\) can be considered as having an incomplete octet as well.
- Therefore, Statement II is correct.
Conclusion: Statement I is incorrect because not all mentioned oxides are amphoteric. On the other hand, Statement II is correct, as all the stipulated compounds possess an incomplete octet.
Thus, the correct answer is: Statement I is incorrect but Statement II is correct.
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