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The pair of compounds which can exist to...

The pair of compounds which can exist together in aqueous solution is

A

`Na_(2)CO_(3) and NaHCO_(3)`

B

`NaHCO_(3) and NaOH`

C

`NaOH and NaH_(2)PO_(4)`

D

`NaOH+NaHPO_(3)`

Text Solution

AI Generated Solution

The correct Answer is:
To determine the pair of compounds that can exist together in an aqueous solution, we need to analyze each option based on their chemical properties and potential reactions. Let's go through the options step by step. ### Step 1: Analyze Option 1 - Na2CO3 and NaHCO3 - **Nature of Compounds**: Both Na2CO3 (sodium carbonate) and NaHCO3 (sodium bicarbonate) are salts derived from a strong base (NaOH) and a weak acid (H2CO3). - **Reactivity**: Since both are basic salts, they do not react with each other in an aqueous solution. Therefore, they can coexist without undergoing a chemical reaction. **Conclusion for Option 1**: Na2CO3 and NaHCO3 can exist together in an aqueous solution. ### Step 2: Analyze Option 2 - NaHCO3 and NaOH - **Nature of Compounds**: NaHCO3 is a weak acid (bicarbonate), while NaOH is a strong base. - **Reactivity**: When NaHCO3 reacts with NaOH, it will undergo a reaction to form Na2CO3 and water. This means they cannot coexist in an aqueous solution without reacting. **Conclusion for Option 2**: NaHCO3 and NaOH cannot exist together in an aqueous solution. ### Step 3: Analyze Option 3 - NaOH and NaH2PO4 - **Nature of Compounds**: NaOH is a strong base, and NaH2PO4 is a weak acid (dihydrogen phosphate). - **Reactivity**: When NaOH reacts with NaH2PO4, it forms Na2HPO4 and water. This indicates that they will react and cannot coexist in an aqueous solution. **Conclusion for Option 3**: NaOH and NaH2PO4 cannot exist together in an aqueous solution. ### Step 4: Analyze Option 4 - NaOH and NaHPO3 - **Nature of Compounds**: NaOH is a strong base, and NaHPO3 is also a salt derived from a weak acid (phosphoric acid). - **Reactivity**: Both compounds are basic in nature and do not react with each other in an aqueous solution. Therefore, they can coexist without forming new compounds. **Conclusion for Option 4**: NaOH and NaHPO3 can exist together in an aqueous solution. ### Final Conclusion The pairs of compounds that can exist together in an aqueous solution are: - **Option 1: Na2CO3 and NaHCO3** - **Option 4: NaOH and NaHPO3**
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