Structure of Atom Test

Result

Structure of Atom Test - 22

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Weekly Quiz Competition

Question 1
4 / -1

The uncertainty in the momentum of an electron is 1.0 × 10^-5 kg ms^-1. The uncertainty in its position will be

A
1.50 × 10^-28 m

B
1.05 × 10^-26 m

C
5.27 × 10^-30 m

D
5.25 × 10^-28 m

Solution
Question 2
4 / -1

Which of the following sets of quantum numbers is correct ?

A
n = 5, l = 4, m = 0, s = +1/2

B
n = 3, l = 3, m = +3, s = + 1/ 2

C
n = 6, l = 0, m = +1, s = -1/ 2

D
n = 4, l = 2, m = +2, s = 0
Question 3
4 / -1

Rutherford’s experiment on scattering of particles showed for the first time that the atom has

A
Electrons

B
Protons

C
Nucleus

D
Neutrons
Question 4
4 / -1

The principal quantum number of an atom is related to the

A
size of the orbital

B
spin angular momentum

C
orbital angular momentum

D
orientation of the orbital in space
Question 5
4 / -1

Transition of an electron from n = 3 to n = 1 level results in

A
emission spectrum

B
band spectrum

C
infrared spectrum

D
X–ray spectrum
Question 6
4 / -1

When alpha particles are sent through a thin metal foil, most of them go straight through the foil because

A
alpha particles are much heavier than electron

B
alpha particles are positively charged

C
alpha particles move with high velocity

D
most part of the atom is empty
Question 7
4 / -1

The increasing order for the values of e/m (charge/mass) is

A
e, p, n, α

B
n, p, e, α

C
n, p, α, e

D
n, α, p, e

Solution
Question 8
4 / -1

The number of unpaired electrons in a chromic ion, Cr³⁺ (atomic number 24) is

A
6

B
4

C
3

D
1

Solution
Question 9
4 / -1

Which one of the following is the smallest in size?

A
N³⁻

B
O²⁻

C
F

D
Na⁺
Question 10
4 / -1

A p – orbital can accommodate

A
4 electrons

B
6 electrons

C
2 electrons with parallel spins

D
2 electrons with opposite spins

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Re-Attempt Weekly Quiz Competition

Structure of Atom Test - 22

Result

Structure of Atom Test - 22

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Question 1

1.50 × 10-28 m

1.05 × 10-26 m

5.27 × 10-30 m

5.25 × 10-28 m

Solution

Question 2

n = 5, l = 4, m = 0, s = +1/2

n = 3, l = 3, m = +3, s = + 1/ 2

n = 6, l = 0, m = +1, s = -1/ 2

n = 4, l = 2, m = +2, s = 0

Question 3

Electrons

Protons

Nucleus

Neutrons

Question 4

size of the orbital

spin angular momentum

orbital angular momentum

orientation of the orbital in space

Question 5

emission spectrum

band spectrum

infrared spectrum

X–ray spectrum

Question 6

alpha particles are much heavier than electron

alpha particles are positively charged

alpha particles move with high velocity

most part of the atom is empty

Question 7

e, p, n, α

n, p, e, α

n, p, α, e

n, α, p, e

Solution

Question 8

6

4

3

1

Solution

Question 9

N3−

O2−

F

Na+

Question 10

4 electrons

6 electrons

2 electrons with parallel spins

2 electrons with opposite spins

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1.50 × 10^-28 m

1.05 × 10^-26 m

5.27 × 10^-30 m

5.25 × 10^-28 m

N³⁻

O²⁻

Na⁺