4 Marks
2026
JEE Main 2026 (Online) 21st January Morning Shift
MCQ SINGLE
Given below are two statements. Statement I: All the pairs of molecules $(PbO,PbO_{2})$; $(SnO,SnO_{2})$ and $(GeO,GeO_{2})$ contain amphoteric oxides. Statement II: $AlCl_{3}$, $BH_{3}$, $BeH_{2}$ and $NO_{2}$ all have incomplete octet.
(A)
Both Statement I and Statement II are correct
(B)
Both Statement I and Statement II are incorrect
(C)
Statement I is correct but Statement II is incorrect
(D)
Statement I is incorrect but Statement II is correct
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Step-by-Step Solution
Statement I Analysis:
$PbO$ is amphoteric, $PbO_2$ is also amphoteric.
$SnO$ is amphoteric, $SnO_2$ is also amphoteric.
$GeO$ is acidic, $GeO_2$ is weakly acidic. Thus, the pair $(GeO, GeO_2)$ does not contain amphoteric oxides.
Therefore, Statement I is incorrect.
Statement II Analysis:
$AlCl_3$: Aluminum has 6 electrons around it (incomplete octet).
$BH_3$: Boron has 6 electrons around it (incomplete octet).
$BeH_2$: Beryllium has 4 electrons around it (incomplete octet).
$NO_2$: Nitrogen has 17 valence electrons, so it has an odd electron and does not complete its octet.
Therefore, Statement II is correct.
Conclusion: Statement I is incorrect, and Statement II is correct.
Correct Answer: D
AI Suggestion: Option D
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Pedagogical Audit
Bloom's Analysis:
This is an APPLY question because it requires applying knowledge of amphoteric oxides and incomplete octets to evaluate the given statements.
Knowledge Dimension:FACTUAL
Justification:The question requires recall of facts about the amphoteric nature of certain oxides and the electronic structure of molecules to determine if they have incomplete octets.
Syllabus Audit:
In the context of JEE, this is classified as KNOWLEDGE. The question directly tests recall and application of factual information related to chemical properties and structure.