Atoms and Molecules Test

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Atoms and Molecules Test - 8

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Weekly Quiz Competition

Question 1
1 / -0

How many times is an atom of Sulphur heavier than an atom of Carbon?

A
8/3 times

B
12 times

C
3/2 times

D
12/321 times

Solution

Atomic mass of Sulphur is 32 u and atomic mass of Carbon is 12 u. So, an atom of Sulphur is 32/12 times or 8/3 times heavier than an atom of Carbon.
Question 2
1 / -0

What is the atomicity of ammonia?

A
0

B
4

C
2

D
3

Solution

The number of atoms present in one molecule of a substance is called its atomicity.

Atomicity of Ammonia (NH₃) is 4 (1 atom of Nitrogen and 3 atoms of Hydrogen)
Question 3
1 / -0

An element X has valency 3 while the element Y has valency 2. Write the formula of the compound formed by X and Y.

A
X₂Y₃

B
XY

C
X₂Y₂

D
X₃Y₃

Solution

The formula of an ionic compound is formed by interchanging the valencies of the constituent atoms. The formula of the compound having atoms of X and Y is X₂Y₃ . The valency (2) of Y forms the subscript of X and the valency (3) of X forms the subscript of Y.
Question 4
1 / -0

An element A forms an oxide with formula A₂O₃. What is its valency?

A
1

B
2

C
3

D
4

Solution

The formula of an ionic compound is formed by interchanging the valencies of the constituent atoms. Therefore, the valency of element A is 3 and that of element O is 2.

Question 5

1 / -0

Match the following with the correct response:

(1) Ozone	(A) Monoatomic
(2) Helium	(B) Tetraatomic
(3) Oxygen	(C) Diatomic
(4) Phosphorous	(D) Triatomic

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

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

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

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

Solution

An element, like Helium, is termed mono-atomic since it can exist independently as a single atom. Oxygen is di-atomic while ozone is tri-atomic.

(1) Ozone	(D) forms a tri-atomic molecule.
(2) Helium	(A) is mono-atomic.
(3) Oxygen	(C) forms a di-atomic molecule.
(4) Phosphorous	(B) forms a tetra-atomic molecule.

Question 6
1 / -0

Match the following with the correct response:

(1) Cobalt (A) S

(2) Copper (B) Co

(3) Sulphur (C) Na

(4) Sodium (D) Cu

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

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

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

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

Solution

A Symbol is a short hand representation of an element.

(1) Symbol of Cobalt (B) Co

(2) Symbol of Copper (D) Cu

(3) Symbol of Sulphur (A) S

(4) Symbol of Sodium (C) Na

Question 7

1 / -0

Match the following with the correct response:

(1) Instrument used to produce images of atoms	(A) Compound
(2) Atomic theory of matter	(B) John Dalton
(3) An allotrope of carbon	(C) STM
(4) Potassium Sulphate	(D) Fullerene

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

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

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

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

Solution

The Scanning Tunneling Microscope (STM) is a type of electron microscope that shows three-dimensional images of a sample. In the STM, the structure of a surface is studied using a stylus that scans the surface at a fixed distance from it. Fullerene is an allotrope of carbon - a form of carbon having a large spheroidal molecule consisting of a hollow cage of sixty or more carbon atoms. Buckminsterfullerene was the first known example. Fullerenes are produced chiefly by the action of an arc discharge between carbon electrodes in an inert atmosphere.

(1) Instrument used to produce images of atoms	(C) STM
(2) Atomic theory of matter	(B) John Dalton
(3) An allotrope of carbon	(D) Fullerene
(4) Potassium Sulphate	(A) Compound

Question 8
1 / -0

What according to Dalton’s atomic theory is true among the following:
(a) Atom is divisible into protons, electrons and neutrons.
(b) Atoms of the same element have different atomic masses.
(c) Atoms are the ultimate indivisible particle of matter.
(d) Atoms of the same element have same atomic masses, size and chemical properties.

A
(a) and (b) are correct

B
(c) and (d) are correct

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

D
All of these

Solution

According Dalton’s atomic theory, atoms are the ultimate indivisible particle of matter and atoms of the same element have same atomic masses, size and chemical properties.
Question 9
1 / -0

During a chemical reaction, the sum of the masses of the reactants and products remains unchanged. This is known as ______________.

A
Law of conservation of mass

B
Law of multiple proportions

C
Law of constant proportions

D
None of these

Solution

Law of conservation of mass states that matter can neither be created not destroyed. Therefore, during a chemical reaction, the sum of the masses of the reactants and products remains unchanged.
Question 10
1 / -0

Which of the two statements is true?

Statement A : Atoms can exist independently.

Statement B : The law of constant proportions is applicable only to pure chemical compounds.

A
Statement A

B
Statement B

C
Both the statements - A and B

D
Neither statement A nor statement B

Solution

An atom cannot exist independently. The law of constant proportions is applicable only to pure chemical compounds.

So, only statement B is correct.

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Re-Attempt Weekly Quiz Competition

(1) Cobalt	(A) S
(2) Copper	(B) Co
(3) Sulphur	(C) Na
(4) Sodium	(D) Cu

(1) Symbol of Cobalt	(B) Co
(2) Symbol of Copper	(D) Cu
(3) Symbol of Sulphur	(A) S
(4) Symbol of Sodium	(C) Na

Atoms and Molecules Test - 8

Result

Atoms and Molecules Test - 8

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Question 1

8/3 times

12 times

3/2 times

12/321 times

Solution

Question 2

0

4

2

3

Solution

Question 3

X2Y3

XY

X2Y2

X3Y3

Solution

Question 4

1

2

3

4

Solution

Question 5

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

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

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

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

Solution

Question 6

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

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

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

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

Solution

Question 7

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

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

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

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

Solution

Question 8

(a) and (b) are correct

(c) and (d) are correct

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

All of these

Solution

Question 9

Law of conservation of mass

Law of multiple proportions

Law of constant proportions

None of these

Solution

Question 10

Statement A

Statement B

Both the statements - A and B

Neither statement A nor statement B

Solution

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X₂Y₃

X₂Y₂

X₃Y₃