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: Understanding the Question:
The acidity or basicity of a salt solution depends on the strength of the acid and base from which the salt is derived.
Step 2: Detailed Explanation:
- \( NH_{4}NO_{3} \): Derived from weak base (\( NH_{4}OH \)) and strong acid (\( HNO_{3} \)). Solution is acidic.
- \( Na_{2}CO_{3} \): Derived from strong base (\( NaOH \)) and weak acid (\( H_{2}CO_{3} \)). The carbonate ion undergoes hydrolysis to produce \( OH^{-} \). Solution is basic.
- \( NaNO_{3} \): Derived from strong base (\( NaOH \)) and strong acid (\( HNO_{3} \)). Solution is neutral.
- \( CuSO_{4} \): Derived from weak base (\( Cu(OH)_{2} \)) and strong acid (\( H_{2}SO_{4} \)). Solution is acidic.
Step 3: Final Answer:
\( Na_{2}CO_{3} \) forms a basic solution in water.