Atoms and Molecules Test

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Atoms and Molecules Test - 43

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Weekly Quiz Competition

Question 1
1 / -0

Why is atom electrically neutral ?

A
It has same number of neutrons & protons

B
It has same number of neutrons & electrons

C
It has same number of protons & electrons

D
None of the above

Solution

Atoms is electrically neutral as the number of protons is equal to the number of electrons. Therefore the negative and positive charge cancels out.
Question 2
1 / -0

Mass number is denoted by:

A
D

B
S

C
A

D
Z

Solution

The mass number (A) is the number of nucleons, which is the total number of protons and neutrons in the nucleus of an atom.
Question 3
1 / -0

An Indian philosopher who said that the smallest particles normally exist in a combined form which gives us various forms of matter is:

A
Pakudha Katyayama

B
Lavoisier

C
Maharishi Kanad

D
None of the above

Solution

-Pakudha Katyayama was an Indian philosopher who said that the smallest particle normally exists in a combined form which gives us various forms of matter.
-Lavoisier was a French chemist. He is regarded as the father of modern chemistry.
-Maharishi Kanad was an Indian philosopher who said that matter is made up of small particles called Parmanu.
Option $$A$$ is correct.
Question 4
1 / -0

_________ deduced that all kind of matter are made up of "anu".

A
Dalton

B
Sir. J. J. Thomson

C
Kanad

D
Rutherford

Solution

Indian philosopher, Kanad in 6th century B.C. said that matter can be broken down into very small particles these small particles were named as "anu" by him.

Hence the correct option is C.
Question 5
1 / -0

1 Nanometer is equal to :

A
$$10^{-10} m$$

B
$$10^{-9} m$$

C
$$10^{-8} m$$

D
$$10^{-7} m$$

Solution

1 Nanometer is equal to $$10^{-9} m$$
Question 6
1 / -0

Which of the following atomic number will most likely form an anion?

A
$$13$$

B
$$18$$

C
$$12$$

D
$$17$$

Solution

The electronic configuration of atomic number $$13$$ is $$2,\,8,\,3$$. It is more likely to lose three electrons to become a positively charged ion i.e cation.

The electronic configuration of atomic number $$18$$ is $$2,\,8,\,8$$. It will neither lose nor gain electrons as it has a stable configuration (octet state). So, it will not form an ion.

The electronic configuration of atomic number $$12$$ is $$2,\,8,\,2$$. It will easily lose two electrons to become a positively charged ion i.e cation.

The electronic configuration of atomic number $$17$$ is $$2,\,8,\,7$$. It will easily accept one electron to become a negatively charged ion i.e anion.
Question 7
1 / -0

Which law was given by Antoine L. Lavoisier?

A
Laws of multiple proportion

B
Law of conservation of mass

C
Both A and B

D
None of the above

Solution

Antoine-Laurent Lavoisier established the law of conservation of mass.
It states that "mass can neither be created nor be destroyed in a chemical reaction."
So, the correct option is $$B$$.
Question 8
1 / -0

A sealed tube containing phosphorus was weighed and heated carefully. After completion of the reaction, the tube was re-weighed under similar conditions. The weight of the tube will:

A
increases

B
decreases

C
remains same

D
None of the above

Solution

According to the law of conservation of mass, the total mass of reactants is equal to the total mass of products in a chemical reaction.

$$P_4 + 5O_2\rightarrow P_4O_{10}$$

As the tube is sealed, the total mass of reactants, $$P_4$$ and $$O_2$$ is equal to the total mass of product formed i.e., phosphorus pentaoxide.
Question 9
1 / -0

According to Dalton, atom combines in a _________ ratio to form compounds.

A
variable

B
fixed

C
Both A and B

D
None of the above

Solution

According to Dalton, atom combines in a $$\text{ fixed}$$ ratio to form compounds.
option $$B$$ is correct.
Question 10
1 / -0

Law of definite proportion does not apply to nitrogen oxide because:

A
Atomic weight of nitrogen is not conserved

B
Molecular weight of nitrogen is variable

C
Nitrogen forms multiple compounds with oxygen

D
Atomic weight of oxygen is variable

Solution

Nitrogen forms multiple compounds with oxygen. Hence, we cannot apply the law of definite proportion to nitrogen oxide.

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Atoms and Molecules Test - 43

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Atoms and Molecules Test - 43

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Question 1

It has same number of neutrons & protons

It has same number of neutrons & electrons

It has same number of protons & electrons

None of the above

Solution

Question 2

D

S

A

Z

Solution

Question 3

Pakudha Katyayama

Lavoisier

Maharishi Kanad

None of the above

Solution

Question 4

Dalton

Sir. J. J. Thomson

Kanad

Rutherford

Solution

Question 5

$$10^{-10} m$$

$$10^{-9} m$$

$$10^{-8} m$$

$$10^{-7} m$$

Solution

Question 6

$$13$$

$$18$$

$$12$$

$$17$$

Solution

Question 7

Laws of multiple proportion

Law of conservation of mass

Both A and B

None of the above

Solution

Question 8

increases

decreases

remains same

None of the above

Solution

Question 9

variable

fixed

Both A and B

None of the above

Solution

Question 10

Atomic weight of nitrogen is not conserved

Molecular weight of nitrogen is variable

Nitrogen forms multiple compounds with oxygen

Atomic weight of oxygen is variable

Solution

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