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.
Post-polishing marble floors are treated with a mild acidic solution to eliminate stains, remove dirt, and improve surface gloss.

Step 2: Oxalic Acid's Function.
- Oxalic acid reacts with the calcium carbonate in marble, creating calcium oxalate. This reaction results in a smooth and glossy finish. - CPWD specifically designates it as the cleaning and finishing agent.

Step 3: Incorrect Options Discarded.
- (B) Caustic Soda: A strong alkali that can harm the marble surface. ✗
- (C) Bleaching Powder: Primarily for disinfection, not for polishing. ✗
- (D) White Cement: Used for joint filling, not for cleaning purposes. ✗

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