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Q: Which is the test performed to find out the presence of soluble matter in a sample of stone?
  • A. Microscopic test
  • B. Crystallization test
  • C. Smith's test
  • D. Freezing and thawing test
Correct Answer: Option C - Smith test– Smith test is performed to find out the presence of any soluble matter in a stone sample. Chips or pieces of stone are taken and they are placed in a glass tube filled with clear water. After sixty minutes the tube is vigorously stirred, presence of earthy matter will convert the clear water into dirty water, if water remains clear, stone is considered durable and free from any soluble matter.
C. Smith test– Smith test is performed to find out the presence of any soluble matter in a stone sample. Chips or pieces of stone are taken and they are placed in a glass tube filled with clear water. After sixty minutes the tube is vigorously stirred, presence of earthy matter will convert the clear water into dirty water, if water remains clear, stone is considered durable and free from any soluble matter.

Explanations:

Smith test– Smith test is performed to find out the presence of any soluble matter in a stone sample. Chips or pieces of stone are taken and they are placed in a glass tube filled with clear water. After sixty minutes the tube is vigorously stirred, presence of earthy matter will convert the clear water into dirty water, if water remains clear, stone is considered durable and free from any soluble matter.