Class XI Chemistry Atomic Structure 1

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Question 1

In which of these cases spectral lines are caused due to emission of electron in hydrogen atom?

• AAbsorption of energy
• BRadiation of energy due to orbital motion
• CEmission of energy
• DNone of these

Question 2

A stationary He⁺ ion emitted a photon corresponding to the first line of the Lyman series. The photon liberates a photo electron from a stationary hydrogen atom in ground state. The kinetic energy of electron is

• A10.2 eV
• B13.6 eV
• C20.4 eV
• D27.2 ev

Question 3

Bohr’s model has failure in demonstrating splitting of spectral lines due to magnetic field. What is this effect known as?

• AZeeman effect
• BStark effect
• CCondensation effect
• DInduction effect

Question 4

which of the following is not a property of cathode rays :

• A they are made up of material particles
• Bthey affect photographic plates
• C they do cause ionization of gas.
• D they do not produce heating effect.

Question 5

What is the de-broglie wavelength of electron accelerated at 400V approximately?

• A1.00nm
• B0.12nm
• C0.08nm
• D0.06nm

Question 6

At temperature T, the average kinetic energy of any particle is . The de Broglie wavelength follows the order:

• AThermal proton > Visible photon > Thermal electron
• BThermal proton > Thermal electron > Visible photon
• CVisible photon > Thermal electron > Thermal neutron
• DVisible photon > Thermal neutron > Thermal electron

Question 7

The orbital diagram in which the Aufbau’s principle is violated is

• A
• B
• C
• D

Question 8

Which quantum number is not related with Schrodinger equation

• APrincipal
• BAzimuthal or orbital
• CMagnetic
• DSpin

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