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State whether the following is true or false.
Photocatalytic cement continues to work in complete darkness.

  • A.False
  • B.True only at large scales
  • C.False only at small scales
  • D.True

Answer: A

Correct answer: False

The reaction is photocatalytic, so it requires ultraviolet light to proceed and stops entirely in the dark. That limits the effect to surfaces which are exposed and reasonably well lit, and it is one of the reasons measured pollution removal in the field falls short of laboratory figures.

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