Which of the following statement is incorrect regarding use of caustic soda? — s Block Elements Chemistry Question

💡 Solution & Explanation

# Analysis of Caustic Soda (NaOH) Uses Since the complete options aren't provided, I'll outline the **common correct uses of NaOH** to identify which statement would be incorrect: ## Correct Uses of NaOH: 1. **Soap manufacturing** — saponification of fats/oils 2. **Paper bleaching** — Kraft process 3. **Petroleum refining** — removal of acidic impurities 4. **Textile industry** — fiber treatment 5. **Metal extraction** — dissolving amphoteric metals like Al ## Typical Incorrect Statements (likely option C): **Common misconceptions include:** - Using NaOH as a **drying agent** ❌ (It's hygroscopic and absorbs water; causes hydrolysis) - Using NaOH to **extract iron from its ore** ❌ (Iron oxides don't dissolve in NaOH) - Using NaOH in **acid-base titration without a buffer** ❌ (Misapplication context) ## Why C is Likely Correct: If option C states something like "*NaOH is used as a desiccant*" or "*NaOH is used to extract iron*," it would be **incorrect** because: - NaOH **absorbs moisture** rather than removing it completely - Only **amphoteric elements** (Al, Zn, Sn, Pb) dissolve in NaOH; iron compounds don't **Answer verification requires seeing all options**, but statements involving NaOH's use in non-amphoteric metal extraction or as a drying agent are typically the incorrect ones.