Question

Which among the following salts forms basic solution when dissolved in water?

• A. \( NH_{4}NO_{3} \)
• B. \( Na_{2}CO_{3} \)
• C. \( NaNO_{3} \)
• D. \( CuSO_{4} \)

Hint:

Strong Base + Weak Acid = Basic Salt. Example: Sodium Carbonate.

Answer 1

The Correct Option is B

Step 1: Hydrolysis Concept
Basic solutions are formed by salts of a **Strong Base** and a **Weak Acid**.
Step 2: Salt Analysis
- $NH_4NO_3$: Weak Base ($NH_4OH$) + Strong Acid ($HNO_3$) $\rightarrow$ Acidic. - $NaNO_3$: Strong Base ($NaOH$) + Strong Acid ($HNO_3$) $\rightarrow$ Neutral. - $CuSO_4$: Weak Base ($Cu(OH)_2$) + Strong Acid ($H_2SO_4$) $\rightarrow$ Acidic. - $Na_2CO_3$: Strong Base ($NaOH$) + Weak Acid ($H_2CO_3$) $\rightarrow$ Basic.
Step 3: Conclusion
$Na_2CO_3$ undergoes anionic hydrolysis to produce $OH^-$ ions.
Final Answer:(B)