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GATE 2023 AR — Architecture – Question 50

Building Construction, Materials, and Structural Systems · Different types of building materials for walls, floor, roof, finishes, repair and retrofitting, acoustic & insulation materials, damp prevention · 1 mark · Multiple choice

Under CPWD Specifications 2019, which material is used for cleaning marble flooring after polishing?

  1. Oxalic acid
  2. Caustic soda
  3. Bleaching powder
  4. White cement

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Show answer and explanation

Correct answer: (A) Oxalic acid

Explanation

The specified marble-finishing process uses oxalic acid, A, in controlled polishing/cleaning work. The other materials do not serve the same specified polishing function. This is identification of the cited specification, not a recommendation to apply an unspecified acid concentration to stone.

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