Structure of Atom · Chemistry · NEET

The quantum numbers of four electrons are given below : I. $$n=4 ; I=2 ; m_1=-2 ; s=-\frac{1}{2}$$ II. $$n=3 ; I=2 ; m_1=1 ; s=+\frac{1}{2}$$ III. $$n...

Given below are two statements: Statement I: The Balmer spectral line for H atom with lowest energy is located at $$\frac{5}{36} R_H \mathrm{~cm}^{-1}...

The energy of an electron in the ground state $$\mathrm{(n=1)}$$ for $$\mathrm{He}^{+}$$ ion is $$\mathrm{-x} \mathrm{~J}$$, then that for an electron...

Match List I with List II. .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-famil...

Incorrect set of quantum numbers from the following is :

Given below are two statements: Statement I : The value of wave function, $$\psi $$ depends upon the coordinates of the electron in the atom. Statemen...

Select the correct Statements from the following : A. Atoms of all elements are composed of two fundamental particles. B. The mass of the electron is ...

The relation between $$\mathrm{n}_{\mathrm{m}},\left(\mathrm{n}_{\mathrm{m}}=\right.$$ the number of permissible values of magnetic quantum number $$(...

Match List-I with List-II : .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-fami...

When electromagnetic radiation of wavelength 300 nm falls on the surface of a metal, electrons are emitted with the kinetic energy of 1.68 $$\times$$ ...

Identify the incorrect statement from the following.

If radius of second Bohr orbit of the He+ ion is 105.8 pm, what is the radius of third Bohr orbit of Li2+ ion?

A particular station of All India Radio, New Delhi broadcasts on a frequency of 1,368 kHz (kilohertz). The wavelength of the electromagnetic radiation...

From the following pairs of ions which one is not an iso-electronic pair?

Which of the following series of transitions in the spectrum of hydrogen atom falls in visible region?

4d, 5p, 5f and 6p orbitals are arranged in the order of decreasing energy. The correct option is :

Which one is a wrong statement?

Which one is the wrong statement ?

How many electrons can fit in the orbital for which n = 3 and $$l$$ = 1?

Which of the following pairs of d-orbitals will have electron density along the axes ?

Two electrons occupying the same orbital are distinguished by

Which is the correct order of increasing energy of the listed orbitals in the atom of titanium ? (At. no. Z = 22)

The angular momentum of electron in 'd' orbital is equal to

The number of d-electrons in Fe2+ (Z = 26) is not equal to the number of electrons in which one of the following ?

Calculate the energy in joule corresponding to light of wavelength 45 nm. (Planck,s constant, h = 6.63 $$ \times $$ 10$$-$$34 J s, speed of light, c =...

Be2+ is isoelectronic with which of the following ions ?

What is the maximum number of orbitals that can be identified with the following quantum numbers ? n = 3, l = 1, m1 = 0

According to law of photochemical equivalence the energy absorbed (in ergs/mole) is given as (h = 6.62 $$ \times $$ 10$$-$$27 ergs, c = 3 $$ \times $$...

The outer electronic configuration of Gd (At. No. 64) is

What is the maximum numbers of electrons that can be associated with the following set of quantum numbers ? n = 3, $$l$$ = 1 and m = $$-$$ 1

The value of Planck's constant is 6.63 $$ \times $$ 10$$-$$34 J s. The speed of light is 3 $$ \times $$ 1017 mm s$$-$$1. Which value is closest to th...

Based on equation E = $$-$$ 2.178 $$ \times $$ 10$$-$$18 J $$\left( {{{{Z^2}} \over {{n^2}}}} \right)$$, certain conclusions are written. Which of the...

The orbital angular momentum of a p-electron is given as

Maximum number of electrons in a subshell with $$l$$ = 3 and n = 4 is

The correct set of four quantum numbers for the valence electron of rubidium atom (Z = 37) is

According to the Bohr theory, which of the following transitions in the hydrogen atom will give rise to the least energetic photon ?

The total number of atomic orbitals in fourth energy level of an atom is

The energies E1 and E2 of two radiations are 25 eV and 50 eV respectively. The relation between their wavelengths i.e., $$\lambda $$1 and $$\lambda $$...

If n = 6, the correct sequence for filling of electrons will be

A 0.66 kg ball is moving with a speed of 100 m/s. The associated wavelength will be (h = 6.6 $$ \times $$ 10$$-$$34 J s)

Which of the following is not permissible arrangement of electrons in an atom ?

Maximum number of electrons in a subshell of an atom is determined by the following

If uncertainty in position and momentum are equal, then uncertainty in velocity is

The measurement of the electron position is associated with an uncertainty in momentum, which is equal to 1 $$ \times $$ 10$$-$$18 g cm s$$-$$1. The u...

Consider the following sets of quantum numbers : .tg {border-collapse:collapse;border-spacing:0;border:none;} .tg td{font-family:Arial, sans-serif;...

The orientation of an atomic orbital is governed by

Given : The mass of electron is 9.11 $$ \times $$ 10$$-$$31 kg, Planck constant is 6.626 $$ \times $$ 10$$-$$34 J s, the uncertainty involved in the m...

The energy of second Bohr orbit of the hydrogen atom is $$-$$328 kJ mol$$-$$1; hence the energy of fourth Bohr orbit would be

The frequency of radiation emitted when the electron falls from n = 4 to n = 1 in hydrogen atom will be (Given ionization energy of H = 2.18 $$ \times...

The velocity of Planck's constant is 6.63 $$ \times $$ 10$$-$$34 J s. The velocity of light is 3.0 $$ \times $$ 108 m s$$-$$1. Which value is closes...

In hydrogen atom, energy of first excited state is $$-$$ 3.4 eV. Then find out K.E. of same orbit of hydrogen atom

Main axis of a diatomic molecule is z, molecular orbital px and py overlap to from which of the following orbitals.

The following quantum numbers are possible for how many orbitals : n = 3, $$l$$ = 2, m = +2 ?

Isoelectronic species are

For given energy, E = 3.03 $$ \times $$ 10$$-$$19 Joules corresponding wavelength is (h = 6.626 $$ \times $$ 10$$-$$34 J sec, c = 3 $$ \times $$ 108 ...