Final answer:
The polyatomic ion that will form an ionic compound with a single sodium ion (Na+) is the nitrate ion (NO3-), since it has a -1 charge which balances the +1 charge of sodium, resulting in the neutral compound sodium nitrate (NaNO3).
Step-by-step explanation:
The question is asking which of the listed polyatomic ions will form an ionic compound with a single sodium ion (Na+). The correct polyatomic ion must have a charge that will balance with the +1 charge of the sodium ion to form a neutral compound. Let's consider each option:
- CO₃2- Carbonate (incorrect typo in question, should be CO32-) will not form a neutral compound with a single sodium ion because two sodium ions would be required to balance the 2- charge.
- PO43- Phosphate ion will not form a neutral compound with a single sodium ion because three sodium ions would be required to balance the 3- charge.
- SO42- Sulfate ion will not form a neutral compound with a single sodium ion because two sodium ions would be required to balance the 2- charge.
- NO₃− Nitrate ion will form a neutral compound with a single sodium ion as it has a 1- charge, balancing the +1 charge of the sodium ion. The compound formed will be sodium nitrate (NaNO₃).
Therefore, the correct answer is (d) NO₃−, as it is the only option that will form a neutral compound with a single sodium ion.