The correct order of the O – O bond length in O₂ , H₂O₂ and O₃is

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#Question id: 19930

#XL - P Chemistry

In the atomic spectrum of hydrogen, the spectral lines pertaining to electronic transition of

n = 4 to n = 2 refers to

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#Question id: 19931

#XL - P Chemistry

When electronic transition occurs from higher energy state to a lower energy state with energy difference equal to ΔE electron volts, the wavelength of line emitted is approximately equal to

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#Question id: 19932

#XL - P Chemistry

If ionising energy of H atom is 13.6 eV, then the second ionising energy of He should be

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#Question id: 19933

#XL - P Chemistry

The first line in the Balmer series in the H atom will have the frequency

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#Question id: 19934

#XL - P Chemistry

The orbital configuration of 24Cr is 3d⁵4s¹. The number of unpaired electrons in is

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#Question id: 19935

#XL - P Chemistry

How many electrons in 19Khave n = 3; l=0 ?