Structure of Atom Test

Result

Structure of Atom Test - 40

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Weekly Quiz Competition

Question 1
4 / -1

The ratio of the difference in energy between the first and the second Bohr orbit to that between the second and the third Bohr orbit is

A

B

C

D

Solution
Question 2
4 / -1

If the speed of electron in the Bohr’s first orbit of hydrogen atom be x, then speed of the electron in the 3^rd orbit is

A
x/9

B
x/3

C
3x

D
9x

Solution
Question 3
4 / -1

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

A

B

C

D

Solution
Question 4
4 / -1

The configuration 1s²2s²2p⁵3s¹ shows

A
ground state of fluorine

B
excited state of fluorine

C
excited state of Neon atom

D

Solution
Question 5
4 / -1

Which of the following has more unpaired d-electrons?

A
Zn⁺

B
Fe²⁺

C
Ni³⁺

D
cu⁺
Question 6
4 / -1

The energy of a photon is given as ∆E /atom = 3.03 × 10⁻¹⁹ J atom⁻¹. Then the wavelength (λ) of the photon is.

A
65.6 nm

B
656 nm

C
0.656 nm

D
6.56 nm

Solution
Question 7
4 / -1

The wave number of first line of Balmer series of hydrogen is 15200 cm^-1. The wave number of first Balmer line of Li²⁺ ion is

A
15,200 cm^-1

B
60,800 cm^-1

C
76,000 cm^-1

D
136,800 cm^-1

Solution
Question 8
4 / -1

What transition in the hydrogen spectrum would have the same wavelength as the Balmer transition, n = 4 to n = 2 in the He⁺ spectrum?

A
n = 4 to n = 1

B
n = 3 to n =2

C
n = 3 to n = 1

D
n = 2 to n = 1

Solution
Question 9
4 / -1

In a Bohr model of an atom, when an electron jumps from n = 3 to n = 1, how much energy will be emitted?

A

B

C

D

Solution
Question 10
4 / -1

At 200^oC, the velocity of hydrogen molecule is 2.0 × 10⁵ cm/sec. In this case the de Broglie wavelength is about

A
1 Å

B
1000 Å

C
100 Å

D
10 Å

Solution