Update

Muft Shiksha™ एक 100% Free Education Portal है 🇮🇳, जिसका उद्देश्य Class 9–12 के हर विद्यार्थी तक High-Quality Education को पूरी तरह मुफ्त पहुँचाना है। 🇮🇳 हम मानते हैं कि अच्छी शिक्षा किसी student की आर्थिक स्थिति पर निर्भर नहीं होनी चाहिए। 🇮🇳 हर विद्यार्थी को वही Quality Study Material, MCQs, Quizzes, Exam Preparation, Concept-Based Learning और Bilingual Support मिलना चाहिए, जो आमतौर पर महंगी Coaching या Premium Platforms में मिलता है। Muft Shiksha™ 🇮🇳 इसी सोच के साथ बनाया गया है

Subjects
0 reads0 ratings0 helpful

Why can sodium hydroxide pellets become wet and later impure in open air?

Answer and explanation

Correct answer: They absorb moisture and can form carbonate with carbon dioxide

Sodium hydroxide is deliquescent, meaning that solid NaOH absorbs water vapour from humid air and may dissolve in the absorbed moisture; this explains why pellets become wet. It also reacts with acidic carbon dioxide in air: 2NaOH + CO₂ → Na₂CO₃ + H₂O. Formation of sodium carbonate changes the composition and lowers the purity of the stored hydroxide. Thus option A correctly explains both observations. The other options describe impossible transformations under ordinary open-air conditions.

Related tags

Sodium HydroxideMoistureCarbon DioxideAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

Was this question useful?

No ratings yetWrite a review / Rate this question

Student Reviews

No published reviews yet.

Add Muft Shiksha to your Home Screen

In Safari, tap Share, then Add to Home Screen.