Class XI Chemistry Atomic Structure 1

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Question 1

The characteristic X rays spectrum is due to

• AThe illumination of target metal by UV radiation
• BThe bombardment of target metal by protons
• CThe bombardment of target metal by electrons
• DThe absorbtion of the radiation by target metal

Question 2

Which transition in the hydrogen atom spectrum will have the same wavelength as the transition, n=4 to n=2 of He⁺ spectrum ?

• AN=4 to n=3
• BN=3 to n=2
• CN=4 to n=2
• DN=2 to n=1

Question 3

Which of the following has same radius as hydrogen in its first orbit?

• AHe⁺ in second orbit
• BBe²⁺ in second orbit
• CLi²⁺ in second orbit
• DLi²⁺ in third orbit

Question 4

Which of the following effects are not explained by Bohr's model of the hydrogen atom?

• AHeisenberg’s uncertainty principle
• BZeeman effect
• CStark’s effect
• DAll of these

Question 5

The energies E2 of two radiation are 25 eV and 50 eV respectively. The relation between their wavelenghs i.e., and will be

• A
• B
• C
• D

Question 6

Calculate the wavenumber of light whose period is 2 × 10^-10 s.

• A14.66 m^-1
• B16.66 cm-1
• C16.66 m-1
• D132.66 m^-1

Question 7

The electron density between 1s and 2s orbital is

• AHigh
• BLow
• CZero
• DNone of these

Question 8

If an electron has magnetic quantum number -2, the value of principal quantum number is

• A1
• B2
• C3
• D4

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