In order to make the floor glossy, it is rubbed with-
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A.
Sodium silicate
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B.
Oxalic acid
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C.
Sodium carbonate
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D.
Sodium hydroxide
Correct Answer:
B. Oxalic acid
Explanation:
Oxalic acid is used to make floors glossy, particularly stone surfaces like marble or terrazzo. When rubbed onto the floor, the acid reacts with the calcium carbonate in the stone to create a hard, thin layer of calcium oxalate crystals. This chemical process, often called crystallization, fills in microscopic scratches and pores to produce a smooth, reflective, and durable high-gloss finish.
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