CUET Level - I JEE Mock Test - 1(Chemistry)

Statement I : According to Bohr's model of hydrogen atom, the angular momentum of an electron in a given stationary state is quantised.

Statement II : The concept of electron in Bohr's orbit, violates the Heisenberg uncertainty principle.

In the light of the above statements, choose the most appropriate answer from the options given below:

• Both statement I andII are incorrect

• Statement I is correct and statement II is incorrect

• Both statement I and II are correct

• Statement I is incorrect and statement II is correct

The energy of an electron in the first Bohr orbit of hydrogen atom is  −2.18×10^-18J. Its energy in the third Bohr orbit is

• One third of this value

• Three times of this value

• 1/n th of this value

• 1/27 of this value

The kinetic energy of an electron is increased four times, the wavelength of the de-Broglie wave associated with it would becomes

• Two times

• Half

• One fourth

• Four times

Which of the following is not explain the electronic structure of atom?

• Atomic models

• Thomson model

• Rutherford model

• All the above

Millikan's oil drop model is used to find

• e/m ratio of electron

• Charge of electron

• Mass of electron

• Velocity of electron

The radiation having the largest wave length is

• Radiowaves

• Gamma- rays

• Microwaves

• All the above

The reaction that takes place when Cl₂ gas is passed through conc.NaOH solution is

• Oxidation

• Reduction

• Displacement

• Disproportionation

A reducing agent is a substance which can

• Accept electron

• Donate electron

• Accept proton

• Donate proton

When different electrode are arranged in decreasing order of their standard reduction potential is known as

• Electrochemical series

• Redox reactions

• Autooxidation

• Electrode potential

Conversion of PbSO₄ to PbS is

• Reduction of S

• Dissociation

• Oxidation of S

• All the above