141.

Total energy of the electron in hydrogen atom above 0 eV leads to

• continuation of energy states

• large number of discrete ionised states

• balmer series

• paschen series

Assertion:  Bohr's atomic model cannot be used to explain multiple electron species.

Reason: It does not take inter-electronic interactions in account.

• If both assertion and reason are true and reason
  is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

Assertion: Total energy of electron in an hydrogen atom is negative.

Reason: It is bounded to the nucleus.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

The series corresponding to minimum wavelength transition in H-atom

• Balmer series

• Lyman series

• Paschen series

• Brackett series

What would be maximum wavelength for Brackett series of hydrogen-spectrum?

• 74589 A^o

• 22790 A^o

• 40519 A^o

• 18753 A^o

What would be the radius of second orbit of  He⁺  ion?

• 1.508 A^o

• 3.023 A^o

• 2.068 A^o

• 4.458 A^o

The wavelength of Lyrnen series for first number
is

• $\frac{4 \times 1.097 \times {10}^7}{3}$ m

• $\frac{3}{4 \times 1.097 \times {10}^7}$ m

• $\frac{4}{3 \times 1.097 \times {10}^7}$ m

• $\frac{3}{4}$× 1.097 × 10⁷ m 

The wavelengths of K_α  X- rays for lead isotopes  Pb²⁰⁸ , Pb²⁰⁶  and  Pb²⁰⁴ are  λ₁, λ₂ and  λ₃ respectively. Then

• λ₂ = $\sqrt{{\mathrm{\lambda }}_1 {\mathrm{\lambda }}_3}$

• λ₂ = λ₁ + λ₃

• λ₂ = λ₁ λ₂

• λ₂ =  $\frac{{\mathrm{\lambda }}_1}{{\mathrm{\lambda }}_3}$

Assertion:  It is essential that all the lines available in the emission spectrum will also be available in the absorption spectrum.

Reason: The spectrum of hydrogen atom is only absorption spectrum.

• If both assertion and reason are true and reason is the correct explanation of assertion

• If both assertion and reason are true but reason is not the correct explanation of assertion

• If assertion is true but reason is false

• If both assertion and reason are false

What is the energy of He⁺ electron in first orbit?

• 40.8 eV

• -27.2 eV

• -54.4 eV

• -13.6 eV