NEET Questions - Chemistry - Structure of Atom

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What is wrong about anode rays?

Their e/m ratio is constant
They are deflected by electrical and magnetic field
They are produced by ionisation of molecules of the residual gas
Their elm ratio depends on nature of residual gas.

When atoms of the gold sheet are bombarded by a beam of á -particles, only a few á-particles get deflected whereas most of them go straight undeflected. This is because

The force of attraction on $ \alpha $ -particles by the oppositely charged electron is not sufficient
The nucleus occupies much smaller volume as compared to the volume of atom
The force of repulsion on fast moving $ \alpha $ -particles is very small
The neutrons in the nucleus do not have any effect on $ \alpha $ -particles.

Which of the following is not a characteristic of Planck’s quantum theory of radiations?

Radiations are associated with energy
Magnitude of energy associated with a quantum is equal to hv
Radiation energy is neither emitted nor absorbed continuously
A body can emit less or more than a quantum of energy.

Which of the following statements is wrong? The probability of finding the electron in $p_x$ orbital is

Maximum on two opposite sides of the nucleus along x-axis
zero at the nucleus
same on all the sides around the nucleus
zero on the z-axis

In uni electron system, the wave number of any spectral line is directly proportional to

the number particles present in the system
the velocity of electron undergoing transition
$ { 1 \over n ^ 2_1 } - { 1 \over n ^2 _2 } $
the charge on the nucleus and the ë of light used.

6. The conclusion that every additional electron enters the orbital with lowest possible energy has been drawn from

Pauli’s exclusion principle
Hund’s rule
Aufbau principle
de-Broglie’s equation.

Which of the following statements is correct?

All electromagnetic radiations do not possess the same velocity
Matter waves are associated with electrical and magnetic fields
Matter waves and electromagnetic radiations are alike
The velocity of matter wave is generally less than that of light

Which experimental observation correctly account for the phenomenon?

Experimental observation : X-rays spectra , Phenomenon:Charge on nucleus
Experimental observation:$ \alpha $ -particle scattering , Phenomenon :Quantized electron orbit .
Experimental observation: Photoelectric effect,Phenomenon:The nuclear atom
Experimental observation: Emission spectra,Phenomenon:Quantization of energy. .

In the Schrodinger’s wave equation $ \phi $ represents

orbit
wave function
wave
radial probability

Which of the following gave the idea of a nucleus of the atom?

Oil drop experiment
Davissonand Germer’s experiment
$ \alpha $ -ray scattering experiment
Austen’s mass spectrogram experiment.

Cathode rays have same charge to mass ratio as

$ \alpha -particles $
$ \beta -rays $
Anode rays
Protons

Which of the following statements is/are correct?

Isotopes have same number of nucleons
Isobars have same number of protons
Isotones have same number of neutrons
Isobars are atoms of different elements with same isotopic number

According to Bohr’s Model of hydrogen atom

Total energy of the electron is quantized
Angular momentum of the electron is quantized and given as $ \sqrt { l ( l +1 )} { h \over 2 \pi } $
Both 1 & 2
None of the above.

Rutherford’s experiment established that

inside the atom there are positive centres immersed in sea of electrons
nucleus contains protons, neutrons and mesons
most of the space in an atom is empty
All 1 , 2 , 3

The correct Schrodinger’s wave equation for an electron with E as total energy and V as potential energy is

$ { \delta ^ 2 \varphi \over \delta x ^2 } + { \delta ^2 \varphi \over \delta y ^2 } + { \delta \varphi \over \delta z ^2 } + { 8 \pi ^2 \over mh ^ 2 } (E-V) \varphi = 0 $
$ { \delta ^ 2 \varphi \over \delta x ^2 } + { \delta ^2 \varphi \over \delta y ^2 } + { \delta \varphi \over \delta z ^2 } + { 8 \pi m \over h ^ 2 } (E-V) \varphi = 0 $
$ { \delta ^ 2 \varphi \over \delta x ^2 } + { \delta ^2 \varphi \over \delta y ^2 } + { \delta \varphi \over \delta z ^2 } + { 8 \pi ^2 m \over h ^ 2 } (E-V) \varphi = 0 $
$ { \delta ^ 2 \varphi \over \delta x ^2 } + { \delta ^2 \varphi \over \delta y ^2 } + { \delta \varphi \over \delta z ^2 } + { 8 \pi m ^2 \over h ^ 2 } (E-V) \varphi = 0 $

NEET Chemistry Questions: Structure of Atom