Chemistry · JEE

Bohr model of a hydrogen atom: its postulates, derivation of the relations for the energy of the electron and radii of the different orbits, limitations of Bohr's model Mock Test for JEE

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Part of Atomic Structure in JEE Main Chemistry.

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Q1ChemistryUnit 2: Atomic Structure

The energy of an electron in the ground state of

\boldsymbol{H}

atom is

-\mathbf{1 3 . 6 e V}

The negative sign indicates that:

Q2ChemistryUnit 2: Atomic Structure

The wavelength of the radiation emitted when an electron falls from Bohr orbit 4 to 2 in hydrogen atom is:

Q3ChemistryUnit 2: Atomic Structure

Which of the following statements about Rutherford's model of an atom are correct? This question has multiple correct options

Q4ChemistryUnit 2: Atomic Structure

An atomic hydrogen is:

Q5ChemistryUnit 2: Atomic Structure

The radius of the stationary state which is also called Bohr radius is given by the expression

r_{n}=n^{2} a_{0}

where the value of

a_{0}

is:

Q6ChemistryUnit 2: Atomic Structure

Assertion To overcome electrostatic force of attraction between electrons and nucleus, they revolve around the nucleus Reason Mass of the atom is almost due to its nucleus

Q7ChemistryUnit 2: Atomic Structure

In 1909 discovered nucleus in his famous gold foil experiment.

Q8ChemistryUnit 2: Atomic Structure

Assertion Bohr proposed that angular momentum of electron in an orbit is quantized. Reason Debroglie derived that

: m u r=n \frac{h}{2 \pi}

Read the above assertion and reason and choose the correct option regarding ¡t.

Q9ChemistryUnit 2: Atomic Structure

Which of the following corresponds to longest wavelength electronic transition?

Q10ChemistryUnit 2: Atomic Structure

The isotope of hydrogen which is/are radioactive in nature:

Q11ChemistryUnit 2: Atomic Structure

The energy change in an electron jump is given by:

Q12ChemistryUnit 2: Atomic Structure

According to J. Chadwick, is not found in hydrogen atom.

Q13ChemistryUnit 2: Atomic Structure

1.8 g hydrogen atoms are excited to radiations. The study of spectra indicates that

27 \%

of the atoms are in 3rd energy level and

15 \%

of atoms in 2 nd energy level and the rest in the ground state. If I.P. of

\mathrm{H}

21.7 \times 10^{-12}

erg. The number of atoms present in III \& II energy level and total energy evolved when all the atoms return to ground state respectively are:

Q14ChemistryUnit 2: Atomic Structure

Given that in the H-atom the transition energy for

n=1

n=2,

Rydberg states in

10.2 \mathrm{eV}

. The energy for the same transition in

B e^{3+}

is:

Q15ChemistryUnit 2: Atomic Structure

Rutherfords alpha particle scattering experiment concluded that:

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