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

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

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

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