As per the CPWD Specifications (2019), the material used for cleaning marble flooring after polishing is \underline{\hspace{1cm}}.
Show Hint
- Oxalic Acid
- Caustic Soda
- Bleaching Powder
- White Cement
The Correct Option is A
Solution and Explanation
Step 1: CPWD specification practice.
Marble flooring after polishing is cleaned with a mild acidic solution to remove stains, dirt, and enhance surface shine.
Step 2: Role of oxalic acid.
- Oxalic acid reacts with calcium carbonate present in marble to form calcium oxalate, which gives a smooth and glossy finish.
- It is specifically prescribed by CPWD as the cleaning and finishing agent.
Step 3: Elimination of wrong options.
- (B) Caustic Soda → Strong alkali, damages marble surface. ✗
- (C) Bleaching Powder → Used for disinfection, not polishing. ✗
- (D) White Cement → Used for filling joints, not for cleaning. ✗
Final Answer: \[ \boxed{\text{Oxalic Acid}} \]
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