Missing table data prevents identification

Steps:

• The question references a table of test results for substances X and Y, but no table is provided.
• Without the table, specific observations (e.g., precipitates, colors) cannot be matched to ion tests.
• Standard tests for ions like Ca²⁺ (white ppt with oxalate), halides (AgNO₃ ppts), or nitrates (brown ring) require those results to identify X and Y.
• Choices involve common ion pairs, but assignment relies on table evidence.

Why D is correct:

• Not enough information; cannot confirm without table.

Why the others are wrong:

• A: Not enough information.
• B: Not enough information.
• C: Not enough information.

Final answer: Not enough information.