Question

As per the CPWD Specifications (2019), the material used for cleaning marble flooring after polishing is \underline{\hspace{1cm}}.

• A. Oxalic Acid
• B. Caustic Soda
• C. Bleaching Powder
• D. White Cement

Hint:

Remember: Marble finishing in CPWD → final rubbing + oxalic acid cleaning = mirror polish.

Answer 1

The Correct Option is A

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: \[ \boxed{\text{Oxalic Acid}} \]