Practice free Chemistry NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
A glow worm of mass 5.0 g emits red light (650 nm) with a power of 0.1 W. entirely in the backward direction. What velocity would it accelerate to after 10 years, if released in free space (and assumed to be alive)?
For principle quantum number n = 4 the total number of orbitals having = 3 is -
(B) n = 4 1s2,2s2,2p6,3s2,3p6,3d10,4s2,4p6,4d10,4f14. =(n-1) = 4-1 = 3 which is f orbit contain 7 orbital.
The presence of one electron each in the three 2p sub-shell of nitrogen is explained by
(B) This is based on Hund's rule of multiplicity. Pairing of electrons can be possible only when all the empty orbitals in 3p level are filled.
Which one of the following statement is not true about the quantum numbers n, l, m and s
(A) Magnetic quantum number 'm' describes the orientation or distribution of electron cloud.
The number of electrons in the valence shell of calcium is
(C) 2 electron in the valence shell of calcium Ca20 = 2, 8, 8, 2.
The brackett series of spectral lines arise when an electron in an excited hydrogen atom jumps from an energy level
(C) This is due to the electronic jump from the level n=5 to the level n=4.
The ratio of the wavelengths of last lines of Balmer and Lyman series is-
The energy of the emitted photon when an electron in Be3+ ion returns from n=2 level to ground state is -
The accelerating potential to be imparted to a beam of electrons to give an effective wavelength of 2.42 nm is
(C)
For electron x 10-8cm
2.42 x 10-7= x 10-8cm
(24.2)2 = 150/V = V=0.256Volt
Which transition of electron in the hydrogen atom emits maximum energy:
(A) E2-E1 is maximum for H atom and E2-E1=hc/
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The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.