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One true colour unit is colour produced by
  • a)
    One mg of formazin in one litre of distilled water
  • b)
    One mg of silicon in one litre of distilled water
  • c)
    one mg of ferric silicon in one litre of distilled water
  • d)
    one mg of platinum as chloroplatinate ionsin one litre of distilled water
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
One true colour unit is colour produced bya)One mg of formazin in one ...
Explanation:
True colour is a measure of the colour caused by dissolved substances in water. It is measured in Platinum Cobalt (Pt-Co) units, also known as APHA units. One true colour unit is equal to the colour produced by 1 mg/L of platinum as chloroplatinate ions in distilled water.

Option D is the correct answer because it mentions the correct substance and the correct concentration that produces one true colour unit. The other options mention different substances or concentrations, which do not produce one true colour unit.

Therefore, the correct answer is option D - one mg of platinum as chloroplatinate ions in one litre of distilled water.
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One true colour unit is colour produced bya)One mg of formazin in one litre of distilled waterb)One mg of silicon in one litre of distilled waterc)one mg of ferric silicon in one litre of distilled waterd)one mg of platinum as chloroplatinate ionsin one litre of distilled waterCorrect answer is option 'D'. Can you explain this answer?
Question Description
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