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Which of the following is true ?

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The outer electronic configuration of the ground state chromium atom is $3 d^{4} 4 s^{2} .$

Gamma rays are electromagnetic radiations of wavelength of $10^{- 6} cm to 10^{- 5} cm .$

The energy of the electron in the 3d orbital is less than that in the 4s orbital of a hydrogen atom.

The electron density in the xy-plane in $3 d_{x^{2} - y^{2}}$ orbital is zero.

answer is C.

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Detailed Solution

(a) False. The configuration is $3 d^{5} 4 s^{2} .$

(b) False. The wavelength of gamma rays is of the order of 10-11 m.

(c)True. In hydrogen atom, the energy of an electron depends only on the principal quantum number of the orbital which it occupies.

(d) False. In xz-plane, there is no electron density if an electron occupies $3 d_{x^{2} - y^{2}}$ orbital.

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