Which of the following does not figure in the list of seven substances selected for international temperature scale ?
Correct answer: D. Zinc (B.P) and mercury (F.P)
- A. Ice (F.P) and steam (B.P)
- B. Oxygen and sulphur (B.P)
- C. Antimony and silver (F.P)
- D. Zinc (B.P) and mercury (F.P)
Explanation
The listed international temperature fixed points include mercury's freezing point, along with zinc's boiling point, so the pair in option d is included. The other options represent the selected fixed-point substances and transitions.
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