STATEMENT-1: Line emission spectra are useful in the study of electronic structure. STATEMENT-2: Each element has a unique line emission spectrum. If both the assertion and the reason are true and the reason is a correct explanation of the assertion If both the assertion and reason are true but the reason is not a correct explanation of the assertion If the assertion is true but the reason is false If both the assertion and reason are false

If both the statement are true and statement -2 is the correct explanation of statement 1

If both the statements are true but statement-2 is not the correct explanation of statement 1

If statement 1 is true and statement 2 is false

If statement 1 is false and statement 2 is true

Statement-1: Emitted radiation will fall in visible range when an electron jump from n=4 to n=2 in H-atom Statement-2: Balmer series radiations belong to the visible range for hydrogen atoms only. If both the assertion and the reason are true and the reason is a correct explanation of the assertion If both the assertion and reason are true but the reason is not a correct explanation of the assertion If the assertion is true but the reason is false If both the assertion and reason are false

If both the statement are true and statement -2 is the correct explanation of statement-1

If both the statements are true but statement-2 is not the correct explanation of statement-1

If statement-1 is true and statement-2 is false

If statement-1 is false and statement-2 is true

Statement 1: The ground state electronic configuration of nitrogen is Statement 2: Electrons are filled in orbitals as per the Aufbau principle, Hund's rule of maximum spin multiplicity, and Pauli's principle. If both the assertion and the reason are true and the reason is a correct explanation of the assertion If both the assertion and reason are true but the reason is not a correct explanation of the assertion If the assertion is true but the reason is false If both the assertion and reason are false

If both the statement are true and statement -2 is the correct explanation of statement-1

2. If both the statements are true but statement-2 is not the correct explanation of statement-1

3. If statement-1 is true and statement-2 is false

4. If statement-1 is false and statement-2 is true

Each questions contains STATEMENT-1 (Assertion) and STATEMENT2- (Reason). Examine the statements carefully and mark the correct answer according to the instructions given below: Statement-1: Orbital having xz plane as node may be 3d xy . Statement-2: 3d xy has zero radial node. If both the assertion and the reason are true and the reason is a correct explanation of the assertion If both the assertion and reason are true but the reason is not a correct explanation of the assertion If the assertion is true but the reason is false If both the assertion and reason are false

If both the statements are true but statement-2 is not the correct explanation of statement-1

If statement-1 is false and statement-2 is true

If both the statement are true and statement -2 is the correct explanation of statement-1

If statement-1 is true and statement-2 is false

Chemistry - Structure Atom - Quiz-7

A dye absorbs a photon of wavelength $λ$ and re-emits the same energy into two photons of wavelengths $λ_{1}$ and $λ_{2}$ respectively. The wavelength $λ$ is related to $λ_{1}$ and $λ_{2}$ as-

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$λ = \frac{λ_{1} + λ_{2}}{λ_{1} λ_{2}}$
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$λ = \frac{λ_{1} λ_{2}}{λ_{1} + λ_{2}}$
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$λ = \frac{λ_{1}^{2} + λ_{2}^{2}}{λ_{1} + λ_{2}}$
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$λ = \frac{λ_{1} λ_{2}}{{(λ_{1} + λ_{2})}^{2}}$

STATEMENT-1: Line emission spectra are useful in the study of electronic structure.

STATEMENT-2: Each element has a unique line emission spectrum.

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

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If both the statement are true and statement -2 is the correct explanation of statement 1
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If both the statements are true but statement-2 is not the correct explanation of statement 1
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If statement 1 is true and statement 2 is false
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If statement 1 is false and statement 2 is true

Statement-1: Emitted radiation will fall in visible range when an electron jump from n=4 to n=2 in H-atom

Statement-2: Balmer series radiations belong to the visible range for hydrogen atoms only.

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

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If both the statement are true and statement -2 is the correct explanation of statement-1
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If both the statements are true but statement-2 is not the correct explanation of statement-1
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If statement-1 is true and statement-2 is false
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If statement-1 is false and statement-2 is true

Statement 1: The ground state electronic configuration of nitrogen is

Statement 2: Electrons are filled in orbitals as per the Aufbau principle, Hund's rule of maximum spin multiplicity, and Pauli's principle.

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

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If both the statement are true and statement -2 is the correct explanation of statement-1
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2. If both the statements are true but statement-2 is not the correct explanation of statement-1
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3. If statement-1 is true and statement-2 is false
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4. If statement-1 is false and statement-2 is true

Each questions contains STATEMENT-1 (Assertion) and STATEMENT2- (Reason).

Examine the statements carefully and mark the correct answer according to the instructions given below:

Statement-1: Orbital having xz plane as node may be 3d_xy.

Statement-2: 3d_xyhas zero radial node.

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

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If statement-1 is false and statement-2 is true
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If both the statements are true but statement-2 is not the correct explanation of statement-1
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If both the statement are true and statement -2 is the correct explanation of statement-1
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If statement-1 is true and statement-2 is false

The quantum number not obtained from the Schrodinger’s wave equation is

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n
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$l$
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m
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s

For a subatomic particle, the uncertainty in position is same as that of uncertainty in its momentum. The
least uncertainty in its velocity can be given as-

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$∆ V = \frac{h}{4 {πm}^{2}}$
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$∆ V = \frac{1}{2 π} \sqrt{\frac{h}{m}}$
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$∆ V = \frac{h}{2 πm}$
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$∆ V = \frac{1}{2 m} \sqrt{\frac{h}{π}}$

Photons of wavelength 4000

A^{o}

are used to break

l_{2}

molecules. The percentage of energy converted to the kinetic energy of atoms will be :

(bond dissociation energy of the molecule is 246.5 kJ/mol)

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12%
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8%
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26%
0%

17%

The wavelength of the spectral line obtained in the spectrum of ${Li}^{+ 2}$ when the transition takes place between levels whose sum is 4 and difference is 2, will be

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11.4 x $10^{- 6}$ cm
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1.14 x $10^{- 6}$ cm
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0.114 x $10^{- 6}$ cm
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1.14 x $10^{- 8}$ cm

Of the following transition in hydrogen atom, the one which gives an absorption line of lowest frequency is

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n = 1 to n = 2
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n = 3 to n = 8
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n = 2 to n = 1
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n = 8 to n = 3

The charge on the electron and proton are reduced to $\frac{2}{3} rd$ of their original values.Let the present value of the Rydberg constant of H-atom be R, then the new value of the Rydberg constant will be

$1 . \frac{2 R}{3} 2 . \frac{4 R}{9} 3 . \frac{8 R}{27} 4 . \frac{16 R}{81}$

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1
0%
2
0%
3
0%
4

In a subshell, if the number of radial nodes is two times the number of angular nodes, then the minimum possible value of the principal quantum number (n) is

[angular nodes are non-zero)

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1
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2
0%

3
0%

4

Orbital having 3 angular node and 3 total nodes is:

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5 p
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3 d
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4 f
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6 d

In hydrogen atom, what is the de Broglie wavelength of an electron in the second Bohr orbit is: [Given that Bohr radius, $a_{0} = 52.9 p m$ ]

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(1) 216 pm
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(2) 211.6 $π$ pm
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(3) $52.9 π$ pm
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(4) 105.8 pm

The number of protons, neutrons and electrons in ${}_{71}^{175}{Lu}$ , respectively, are:

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104, 71 and 71
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71, 71 and 104
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175, 104 and 71
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71, 104 and 71

Assertion: The spectrum of ${He}^{+}$ is expected to be similar to that of hydrogen

Reason: He⁺ is also a one-electron system.

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

For d-electron, the orbital angular momentum is

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$\frac{\sqrt{2} h}{2 π}$
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$\frac{\sqrt{2 h}}{2 π}$
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$\frac{\sqrt{2 \times 4} h}{2 π}$
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$\frac{\sqrt{6} h}{2 π}$

Assertion: The number of radials and angular nodes for 3p orbital is 1, 1 respectively.

Reason: The number of radials and angular nodes depends only on the principal quantum number.

assertion.

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

Electron density in the yz plane of 3d_xy orbital is

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zero
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0.50
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0.75
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0.90

A macroscopic particle of mass 100 g and moving at a velocity of 100 cm s–1 will
have a de Broglie wavelength of

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6.6 × 10^–29 cm
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6.6 × 10^–30 cm
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6.6 × 10^–31 cm
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6.6 × 10^–32 cm

Which of the following does not represent the mathematical expression for the Heisenberg uncertainty principle?

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$∆ x . ∆ p \geq \frac{h}{4 π}$
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$∆ x . ∆ v \geq \frac{h}{4 πm}$
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$∆ E . ∆ t \geq \frac{h}{4 π}$
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$∆ E . ∆ x \geq \frac{h}{4 π}$

The wavelength associatedd with a golf ball weighing 200 g and moving at a speed of 5 m/h is of the order:

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$10^{- 10} m$
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$10^{- 20} m$
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$10^{- 30} m$
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$10^{- 40} m$

The energy of an electron in the first Bohr's orbit of an H-atom is -13.6 eV. The possible energy value (s) of the excited state(s) for electrons in Bohr's orbits of hydrogen is (are):

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-3.4 eV
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-4.2 eV
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-6.8 eV
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+6.8 eV

In Bohr series of lines of hydrogen spectrum, the third line from the red end corresponds to which one of the following inter orbit jumps of the electron for Bohr's orbits in an atom of hydrogen?

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$3 \to 2$
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$5 \to 2$
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$4 \to 1$
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$2 \to 5$

The de Broglie wavelength of a tennis ball of mass 60 g moving with a velocity of 10 metres per second is approximate-

(Planck's constant, $h = 6.63 \times 10^{- 34} J s$ )

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$10^{- 33}$ metres
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$10^{- 31}$ metres
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$10^{- 16}$ metres
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$10^{- 25}$ metres

The number of electrons with the azimuthal quantum number l = 1 and 2 for C24r in ground state is

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16 and 5
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12 and 5
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16 and 4
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12 and 4

The wavelength of the radiation emitted when in a H atom, the electron falls from infinity to stationary state 1, is:

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$15 n m$
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192 nm
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406 nm
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91 nm

The number of radial nodes of 3s and 2p-orbitals are respectively:

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2,0
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0,2
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1,2
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2,1

The concept that contradicts the Bohr Model of an atom is

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Rutherford Model
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Heisenberg's Uncertainty Principle
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J.J. Thomson Model
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Photoelectric Effect

Electrons are emitted with zero velocity from a metal surface when it is exposed to radiation of wavelength 6800 Å. The work function (W₀) of the metal is

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3.109 x 10^-20 J
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2.922 x 10^-19J
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4.031 x 10¹⁹ J
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2.319 x 10^-18 J

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Practice Chemistry Quiz Questions and Answers

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Practice Chemistry Quiz Questions and Answers

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