Sodium chloride forms a neutral solution in water

Steps:

• Sodium chloride (NaCl) dissociates into Na⁺ and Cl⁻ ions in distilled water.
• Na⁺ comes from strong base NaOH; Cl⁻ from strong acid HCl; neither hydrolyzes significantly.
• The solution has pH 7, indicating neutrality.
• Universal indicator turns green at pH 7.

Why B is correct:

• NaCl is a neutral salt from strong acid and strong base, yielding pH 7 where universal indicator shows green per standard pH color scale.

Why the others are wrong:

• A is wrong: Blue indicates weak alkali (pH 8–10), but solution is neutral.
• C is wrong: Purple indicates strong alkali (pH 10+), but solution is neutral.
• D is wrong: Red indicates acidic (pH 0–3), but solution is neutral.

Final answer: B