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Question
Which of the following is not used as a medium for high temperature heating?
Options:
A .  Dowtherm
B .  Mercury
C .  Liquid metal (e.g. molten sodium)
D .  Fused salts (e.g., an eutectic mixture of 53% KNO₃, 40% NaNO₂and 7% NaNO₃)
Answer: Option B
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