JEE Main Chemistry Atomic Structure Online Test, Jee Main Model Test

A continuum in spectrum is observed due to the following.

The correct order of wavelength of Hydrogen (₁H¹), Deuterium (₁H²) and Tritium (₁H³) moving with same kinetic energy is

Two atoms are said to be isobars if

Selected the correct alternate.

The following transition occurs when Lithium atoms are sprayed into hot flame. The various steps are numbered for identification.

Which of these transition result in emission of light?

Which has [Ar] 3d⁵4s¹ configuration each having 24 e?

The quantum numbers of six electrons are given below. Arrange them in the order of increasing energies.

I. n = 4, l = 2, m_l = – 2, m_s = –1/2

II. n = 3, l = 2, m_l = 1, m_s = +1/2

III. n = 4, l = 1, m_l = 0, m_s = +1/2

IV. n = 3, l = 2, m_l = – 2, m_s = –1/2

V. n = 3, l = 1, m_l = – 1, m_s = +1/2

VI. n = 4, l = 1, m_l = 0, m_s = +1/2

if each orbital can hold a maximum of 3 electrons, the number of elements in 4^th period of Periodic Table (long form) is

The ionization energy of gaseous Na atoms is 495.80 kJ mol^–1. The lowest possible frequency of light that can ionize a Na atom is

A mixture contains atoms of fluorine and chlorine. The removal of an electron from each atom of sample absorbs 284 kJ while the addition of an electron to each atom of mixture release 68.89 kJ. Determine the percentage composition of the F in the mixture, given that the ionization energies of F and Cl are 27.91 × 10^–22 and 20.77 × 10^–22 kJ, respectively, and electron affinities are 5.53 × 10^–22 and 5.78 × 10^–22 kJ respectively.

Select the correct matching for 3d orbital.

The uncertainty in position and velocity of the particle are 0.2 nm and 10.54 × 10^–27 ms^–1 respectively then the mass of the particle is: (h = 6.625 × 10^–34 Js)

Which of the following conclusions could not be derive from Rutherford’s a–particle scattering experiment?

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

If the nitrogen atom had electronic configuration 1s⁷, it would have energy lower that of normal ground state configuration 1s² 2s² 2p³, because the electrons would be closer to the nucleus. Yet 1s⁷ is not observed because it violates:

Given this set of quantum numbers for a multi–electron atom 2, 0, 0, 1/2 and 2, 0, 0,–1/2 . What is the next higher allowed set of n and l quantum numbers for this atom in its ground state?

In the following electronic configuration, some rules have been violated

I : Hund           II : Pauli’s exclusion                III : Aufbau

The atomic weight of an element is double of its atomic number. If there are four electrons in 2p orbital, the element is isotonic with

S-orbital is spherically symmetrical hence

The sub shell that arises after f sub shell is called g sub shell. What is the total number of orbitals in the shell in which the g sub shell first occur?