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CBSE

NEET Chemistry : Structure of Atom

Multiple Choice Questions

101.

Which of the following sequence is correct as per Aufbau principle ?

3s < 3d < 4s < 4p
ls < 2p < 4s < 3d
2s < 5s < 4p < 5d
2s < 5s < 4p < 5f

102.

The magnitude of orbital angular momentum of an electron of azimuthal quantum number 2 is :

$\frac{2 h}{2 π}$
$\frac{\sqrt{6} h}{2 π}$
$\frac{\sqrt{2} h}{2 π}$
$\frac{6 h}{2 π}$

103.

Orbital is :

circular path around the nucleus in which the electrons revolves
space around the nucleus where the probability of finding the electron is maximum
amplitude of electron wave
none of the above

104.

Which of the following transitions have minimum wavelengths ?

n₄ $\to$ n₁
n₂ $\to$ n₁
n₄ $\to$ n₂
n₃ $\to$ n₁

105.

What is the frequency of a X-ray photon whose momentum is 1.1 x 10^-23 kg-ms^-2?

5 x 10¹⁶ Hz
0.5 x 10²⁷ Hz
0.5 x 10¹⁸ Hz
5 x 10¹⁸ Hz

106.

For an electron , if the uncertainty in velocity is $∆$ v , the uncertainty in its position ( $∆$ x) is given by :

$\frac{hm}{4 π ∆ ν}$
$\frac{4 π}{hm ∆ ν}$
$\frac{h}{4 πm ∆ v}$
$\frac{4 πm}{h ∆ ν}$

107.

For a certain particle , it is found that uncertainty in velocity is reciprocal of uncertainty in position .This implies that :

mass of particle > unity
mass of particle = unity
mass of particle $\leq$ h
mass of particle $\geq$ h / 4 $π$

108.

Which of the following sets of quantum numbers is not possible ?

n = 4 , l =1 , m = 0 , s = $+ \frac{1}{2}$
n = 4 , l = 3 , m = - 3 , s = $- \frac{1}{2}$
n = 4 , l = 1 , m = + 2 , s = $- \frac{1}{2}$
n = 4 , l = 0 , m = 0 , s = $- \frac{1}{2}$

109.

Assume that you are travelling at a speed of 90 km/h in a small car with a mass of 1050 kg. If the uncertainty in the velocity of the car is 1% ( $∆$ = 0.9 km/h), what is the uncertainty (in meters) in the position of the car ?

$∆ x \geq 1 \times 10^{- 35} m$
$∆ x \geq 2 \times 10^{- 37} m$
$∆ x \geq 2 \times 10^{- 36} m$
$∆ x \geq 4 \times 10^{- 38} m$

110.

A metal surface is exposed to solar radiations :

the emitted electrons have energy less than a maximum value of energy depending upon frequency of incident radiations
the emitted electrons have energy less than maximum value of energy depending upon intensity of incident radiations
the emitted electrons have zero energy
the emitted electrons have energy equal to energy of photons of incident light

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NEET Chemistry : Structure of Atom

Multiple Choice Questions