Structure of the Atoms Test

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Structure of the Atoms Test - 7

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following is not observed by Rutherford in α-particle scattering experiment?
(a) Most of the α-particles rebound after hitting the gold foil.
(b) Some of the particles deflect by their path.
(c) Some of the particles do not pass through the goil foil.
(d) Most of the particles pass straight through the gold foil.

A
(a) and (c) are correct

B
(a) and (b) are correct

C
(a), (b) and (c) are correct

D
All of these

Solution

Rutherford observed that some of the α-particles were deflected from their path after hitting the gold foil while most of the particles went straight through the gold foil.
Question 2
1 / -0

Which of the following is correct about an atom?
(a) It is the smallest unit of matter.
(b) Size of an atom is very large as compared to the size of nucleus of the atom.
(c) In an atom, the number of protons is equal to the number of electrons.
(d) Atoms are stable.

A
(a) and (b) are correct

B
(a) and (c) are correct

C
(a), (b) and (c) are correct

D
All of these

Solution

An atom is the smallest unit of matter. Size of an atom is very large as compared to the size of the nucleus of the atom. In an atom, the number of protons is equal to the number of electrons. Atoms are stable particles.
Question 3
1 / -0

Which of the following statements is/are correct about β-particles :
(a) They are electrons.
(b) They are deflected towards positive electrode.
(c) They travel at the speed of sound.
(d) They are deflected towards negative electrode.

A
(a) and (b) are correct

B
(b) and (c) are correct

C
(a), (b) and (c) are correct

D
All of these

Solution

β-particles are electrons. They are deflected towards the positive electrode.
Question 4
1 / -0

The electronic configuration of an element A is 2, 8, 6. How many electrons does it require to have a stable configuration?

A
2

B
6

C
0

D
8

Solution

The number of electrons required to complete the octet reprersents the valency of an atom with electronegative character. The element with electronic configuration 2,8,6 will require 2 electron to achieve a stable configuration.
Question 5
1 / -0

The number of valence electrons in Cl^- ion is:

A
8

B
16

C
18

D
17

Solution

The number of electrons present in the outermost shell of an atom is called the valence electrons. Chlorine atom contains 7 electrons in the outermost shell. Chlorine ion (Cl^-) will have (7+1) electrons or 8 electrons in the outermost shell.
Question 6
1 / -0

Which element(s) have 7 electrons in their valence shell?

A
Cl

B
N

C
F

D
Both Cl and F

Solution

Atomic number of Chlorine (Cl) is 17. Electronic configuration is 2,8,7. So, 7 electrons are present in the valence shell of Chlorine.

Atomic number of Fluorine (F) is 9. Electronic configuration is 2,7. So, 7 electrons are present in the valence shell of Fluorine.

Atomic number of Nitrogen (N) is 7. Electronic configuration is 2,5. So, 5 electrons are present in the valence shell of Nitrogen.
Question 7
1 / -0

What is the physical state of water at 10⁰C ?

A
Solid

B
Ionic

C
gas

D
Liquid

Solution

The physical state of water at 10⁰C is the liquid state. Below 0⁰C water in solid state and above 100⁰C water in the vapour state.

Question 8

1 / -0

Match the following with the correct response:

(1) Carbon	(A) 2,8,1
(2) Sodium	(B) 2
(3) Argon	(C) 2,8,8
(4) Helium	(D) 2,4

1-C, 2-B, 3-D, 4-A

1-A, 2-C, 3-B, 4-D

1-D, 2-A, 3-C, 4-B

1-B, 2-D, 3-A, 4-C

Solution

(1) Electronic configuration of Carbon	(D) 2,4
(2) Electronic configuration of Sodium	(A) 2,8,1
(3) Electronic configuration of Argon	(C) 2,8,8
(4) Electronic configuration of Helium	(B) 2

Question 9
1 / -0

Which of the following elements have the same valency?
(a) An element with atomic number 12
(b) An element with atomic number 6
(c) An element with atomic number 4
(d) An element with atomic number 2

A
(a) and (c) are correct

B
(b) and (c) are correct

C
(a), (b) and (c) are correct

D
All of these

Solution

The element with atomic number 12 will have a electronic configuration of 2,8,2. The element with atomic number 6 will have a electronic configuration of 2,4. The element with atomic number 4 will have a electronic configuration of 2,2. The element with atomic number 2 will have a electronic configuration of 2 (duplet). So. (a) and (c) will have the same valency.
Question 10
1 / -0

What is the actual mass of a proton?

A
1.67 × 10⁻²⁷ Kg

B
6.023 × 10²³ Kg

C
9.1×10⁻¹⁹ Kg

D
None of these

Solution

The mass of a proton is 1.67×10⁻²⁷Kg or 1.67 × 10⁻²⁴g. A proton is 1837 times heavier than an electron.

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Structure of the Atoms Test - 7

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Structure of the Atoms Test - 7

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Question 1

(a) and (c) are correct

(a) and (b) are correct

(a), (b) and (c) are correct

All of these

Solution

Question 2

(a) and (b) are correct

(a) and (c) are correct

(a), (b) and (c) are correct

All of these

Solution

Question 3

(a) and (b) are correct

(b) and (c) are correct

(a), (b) and (c) are correct

All of these

Solution

Question 4

2

6

0

8

Solution

Question 5

8

16

18

17

Solution

Question 6

Cl

N

F

Both Cl and F

Solution

Question 7

Solid

Ionic

gas

Liquid

Solution

Question 8

1-C, 2-B, 3-D, 4-A

1-A, 2-C, 3-B, 4-D

1-D, 2-A, 3-C, 4-B

1-B, 2-D, 3-A, 4-C

Solution

Question 9

(a) and (c) are correct

(b) and (c) are correct

(a), (b) and (c) are correct

All of these

Solution

Question 10

1.67 × 10−27 Kg

6.023 × 1023 Kg

9.1×10−19 Kg

None of these

Solution

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1.67 × 10⁻²⁷ Kg

6.023 × 10²³ Kg

9.1×10⁻¹⁹ Kg