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Test: Structure of Atom (April 26) - JEE MCQ


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15 Questions MCQ Test - Test: Structure of Atom (April 26)

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Test: Structure of Atom (April 26) - Question 1

Electronic configuration of the element having atomic number 24.

Detailed Solution for Test: Structure of Atom (April 26) - Question 1

Atomic no 24 is of Cr. Due to half filled orbital stability it doesnot follow Afbau rule so its configuration is 

Test: Structure of Atom (April 26) - Question 2

The atom with the given atomic number Z=17, and the atomic mass A=35.5 is

Detailed Solution for Test: Structure of Atom (April 26) - Question 2

The element with atomic number(Z) 17 & mass number (A) 35 is chlorine = 

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Test: Structure of Atom (April 26) - Question 3

Correct expression for mass number A is

Detailed Solution for Test: Structure of Atom (April 26) - Question 3

Mass no. = no. of protons + no. of neutrons.

Test: Structure of Atom (April 26) - Question 4

According to quantum mechanics ψ2(r) the wave function squared gives

Detailed Solution for Test: Structure of Atom (April 26) - Question 4

ψ has no physical significance while ψ2 represnts the probability density of finding an electron.

Test: Structure of Atom (April 26) - Question 5

Spin quantum number with two spin states of the electron represented by two arrows, ↑ (spin up) and ↓ (spin down) was introduced to account for

Detailed Solution for Test: Structure of Atom (April 26) - Question 5

In anomalous Zeeman effect the splitting of spectral lines occurs due to interaction of the applied magnetic field with the magnetic moment generated by the orbital and 'spin' motions of the electron.

Test: Structure of Atom (April 26) - Question 6

Values of e/m (charge/mass) in the categories alpha particle (α), electron (e) and protons (p) increase in the order:

Detailed Solution for Test: Structure of Atom (April 26) - Question 6

E/m values of particle (α), electron (e) and protons (p) increase in the order α< p < e

Test: Structure of Atom (April 26) - Question 7

A gas absorbs a photon of 355 nm and emits at two wavelengths. If one of the emissions is at 680 nm, the other is at: 

Detailed Solution for Test: Structure of Atom (April 26) - Question 7

Test: Structure of Atom (April 26) - Question 8

The electronic configuration 1s22s22p1 belongs to

Detailed Solution for Test: Structure of Atom (April 26) - Question 8

It is of boron as it has atomic number 5.

Test: Structure of Atom (April 26) - Question 9

The energy associated with the first orbit in the hydrogen atom is -2.18 x 10−18 J/atom. What is the energy associated with the fifth orbit?

Detailed Solution for Test: Structure of Atom (April 26) - Question 9

Energy for any n shell = -2.18 x 10−18 )/n'2 (') stands for raise to the power of therefore, E associated with 5 orbit = -2.18 x 10−18/52 = -2.18 × 10-18/25 = -218 × 10-20/25 = -8.72 x 10-20J/atom

Test: Structure of Atom (April 26) - Question 10

Isobars are the atoms with

Detailed Solution for Test: Structure of Atom (April 26) - Question 10

Isobars are the atoms with same mass number but different atomic number.

Test: Structure of Atom (April 26) - Question 11

Due to the presence of electrons in the inner shells, the electron in the outer shell will not experience the full positive charge of the nucleus (Ze). This is known as

Detailed Solution for Test: Structure of Atom (April 26) - Question 11

This is known as shielding effect. Inner lying electrons shields the positive charge reaching the outer most electrons.

Test: Structure of Atom (April 26) - Question 12

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

Detailed Solution for Test: Structure of Atom (April 26) - Question 12

In this question l=3 means the sub shell is f & n=4 means it is present in 4th orbit.
Finally it is a 4f sub shell.
The no of orbital in f sub shell =2l+1
                                                = 2*3+1
                                                =7
Each orbital can accommodate 2 electrons.
  7*2 = 14 electrons.

Maximum number of electrons in a sub shell with l=3& n=4 (4f) is 14electrons.

Test: Structure of Atom (April 26) - Question 13

Arrange the electrons present in the 4d, 3d, 4p and 3p orbitals in order of increasing energies

Detailed Solution for Test: Structure of Atom (April 26) - Question 13

Energy of orbital is determined by n+l value. The orbital having higher n+l value will have higher energy. If n+l value is same then orbital having higher n value will have higher energy.

Test: Structure of Atom (April 26) - Question 14

Isotopes are the atoms with

Detailed Solution for Test: Structure of Atom (April 26) - Question 14

Isotopes have same atomic no. but different mass no.

Test: Structure of Atom (April 26) - Question 15

The Aufbau principle states : In the ground state of the atoms, the orbitals are filled in order of

Detailed Solution for Test: Structure of Atom (April 26) - Question 15

According to Aufbau rule electrons are filled in increasing order of energy.

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