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CBSE 11th Standard Chemistry Subject Structure of Atom Ncert Exemplar 1 Mark Questions 2021

Published on: 27/05/2021

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Std: 11th Standard CBSE - Chemistry

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Questions:

Generic 2

5 x 2 = 10

Arranges, p and d- subshells of a shell in the increasing order of effective nuclear charge (Zeff) experienced by the electron present in the nucleus.

Which of the following orbitals are degenerate?

out of the electron and proton which one will have a higher velocity to produce matter waves of the same velocity? Explain it.

What is the experimental evidence in support of the idea that electronic energies in an atom are quantised?

Which of the following will not show deflection from the path on passing through an electric field? Proton, cathode rays, electron, neutron

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Answers Key:

Generic 2

5 x 2 = 10

S- orbital is spherical in shape, it shields the electrons from the nucleus more effectively than p-orbital which in turn shields more effectively than d-orbital. Therefore, the effective nuclear charge (Zeff) experienced by electrons present in them is d.

The orbitals which belong to same subshell and same shell are called degenerate orbitals.(3d_xy,3d_z²,3d_yz) and (4 d_xy,4 d_zy,4 d_z²) are the two sets of degenerate orbitals

From de-Broglie equation wavelength λ=h/mv.For same wavelength with two different particles,i.e electron and proton m₁v₁= m₂v₂ (his constant). Lesser than the mass of the particle, greater will be the velocity. Hence, electron will have higher velocity.

The line spectrum of any element has lines corresponding to definite wavelengths. Lines are obtained as a result of electronic transitions between the energy levels. Hence, the electrons in these levels have fixed energy, i.e quantised values.

Neutron is a neutral practice. Hence it will not be deflected on passing through an electric field.