Which of the following vapour/gas will give yellow colour in a filament lamp?

Which of the following vapour/gas will give yellow colour in a filament lamp? 

 (a) Helium (b) Mercury (c) Magnesium (d) Sodium
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Answer :

Which of the following vapour/gas will give yellow colour in a filament lamp? 

 (a) Helium (b) Mercury (c) Magnesium (d) Sodium

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Answer :

Sodium
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