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Which of the following is not a composition of Nernst glower or Nernst filament?

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Which of the following is not a composition of Nernst glower or Nernst filament?

(a) Oxides of Zirconium

(b) Oxides of Barium

(c) Oxides of Yitrium

(d) Oxides of Thorium

The question was asked in an international level competition.

My enquiry is from Instrumentation of IR in division Colorimetry and Spectrometry of Analytical Instrumentation

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Right answer is (b) Oxides of Barium

Best explanation: Oxides of Barium is not present in Nernst glower. They are constructed by fusing oxides of Zirconium, yitrium and thorium.

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