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Q.

The number of following statement/s which is/are incorrect is ……
A) Line emission spectra are used to study the electronic structure  
B) The emission spectra of atoms in the gas phase show a continuous spread of wavelength from red to violet. 
C) An absorption spectrum is like the photographic negative of on an emission spectrum 
D) The element helium was discovered in the sun by spectroscopic method

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Detailed Solution

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A, C, D are correct statements 

The emission spectra of atoms which do not show continuous spread of wavelength. but emit only at specific wavelength is known as line spectra.

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The number of following statement/s which is/are incorrect is ……A) Line emission spectra are used to study the electronic structure  B) The emission spectra of atoms in the gas phase show a continuous spread of wavelength from red to violet. C) An absorption spectrum is like the photographic negative of on an emission spectrum D) The element helium was discovered in the sun by spectroscopic method