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______ are granite pieces with their surfaces hardened by keeping immersed in soda silicate for about two months.

  • A.Ransom stone
  • B.Imperial stone
  • C.Bituminous stone
  • D.Victoria stone

Answer: D

Victoria stone is made of granite pieces whose surfaces are hardened by immersion in a solution of soda silicate (sodium silicate) for about two months. Ransom stone is an artificial stone made by sand and a solution of sodium silicate, Imperial stone is made of granite chips and cement, and bituminous stone is a stone mixed with bitumen. So the description in the stem fits Victoria stone as marked in the key.

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