. Pick up false statement :

Question - . Pick up false statement :

Options:

A . Copper-constantan thermocouple is a stable couple resistant to both oxidising and reducing atmosphere, but needs protection from acidic vapours

B . Copper-constantan thermocouple is used as a reference standard for calibration purposes.

C . Iron-constantant couple can be made stable by using enamelled iron

D . Both wires of chromel-alumel thermocouples are prone to damage by sulphurous gases

Answer: Option B

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