Atoms and Molecules Test

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Atoms and Molecules Test - 49

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Weekly Quiz Competition

Question 1
1 / -0

Formula unit mass for $$(NH_{4})_{2}SO_{4}$$ is :

A
142 u

B
129 u

C
137 u

D
132 u

Solution

Formula unit mass for $$(NH_{4})_{2}SO_{4}$$
$$ = 2\times atomic\ mass\ of\ N + 8\times atomic\ mass\ of\ H + 1\times atomic\ mass\ of\ S$$
$$ \\\\\\\\\ + 4\times atomic\ mass\ of\ O $$
$$= 2\times 14 + 8\times 1 + 1\times 32 + 4\times 16 $$
$$= 28 + 8 + 32 + 64$$
$$= 132\ u$$.
Question 2
1 / -0

Which of the following is the unit of molar mass?

A
u/mole

B
g/mole

C
g/litre

D
None of above.

Solution

Molar mass is the mass of one mole of a substance. it's mostly measured in g/mole or kg/mole.
Question 3
1 / -0

Dalton's theory fails to determine the existence of:

A
molecules

B
compounds

C
allotropes

D
All of the above

Solution

Dalton's atomic theory fails to explain the existence of allotropes; it does not account for differences in properties of charcoal, graphite, diamond.
Question 4
1 / -0

According to Democritus, matter is made up of:

A
small, indivisible particles

B
large particles

C
large, divisible particles

D
None of above

Solution

Democritus hypothesized that if we go on dividing matter, a stage will come when particles obtained cannot be divided further. He called these small indivisible particles that make up matter - 'atomos'.
Question 5
1 / -0

Which of the following scientist did not believe in atomic theory at all?

A
Aristotle

B
Democritus

C
Rutherford

D
Proust

Solution

Aristotle did not believe in the atomic theory and he gave his own idea of matter. He thought that all materials on earth were made of four elements, earth, fire, water, and air.
Question 6
1 / -0

Who thought that all materials were made of the four elements, earth, fire, water, and air?

A
Dalton

B
Aristotle

C
Thomson

D
Chadwick

Solution

Aristotle did not believe in the atomic theory - he thought that materials on Earth were made of earth, fire, water, and air.
So, the correct option is B.
Question 7
1 / -0

The theory that the universe is composed of two elements, the atoms, and the void, in which they exist and move was given by:

A
Bohr

B
Dalton

C
Leucippus

D
Werner

Solution

Democritus's mentor, Leucippus, originally came up with the atomic theory, but it was then adopted by Democritus. The atomic theory stated that the universe is composed of two elements: the atoms and the void in which they exist and move.
Question 8
1 / -0

Greek philosophers, ______and _______suggested that matter is made up of tiny indivisible particles called atoms.

A
Democritus and Leucippus

B
Dalton and Rutherford

C
Einstein and Kanad

D
Democritus and Dalton

Solution

(A) Greek philosophers, Democritus and Leucippus suggested that matter is made up of tiny indivisible particles called atoms. Atom is the word derived from the Greek word "atomos".

(B) Dalton was an English chemist who introduced an atomic theory and Rutherford discovered the atomic nucleus.

(C) Einstien was a physicist who developed the theory of relativity and Maharishi Kanad was an Indian philosopher who said that matter is made up of small particles called Parmanu.

(D) Democritus was a Greek philosopher who suggested that matter is made up of tiny individual particles called atoms but Dalton was an English chemist who introduced the first scientific atomic theory.

So the correct answer is (A).
Question 9
1 / -0

Democritus' atomic theory states that:

A
atoms are homogeneous

B
atoms are indestructible

C
atoms are solid but invisible

D
all of the above

Solution

According to Democritus, atoms were minuscule quantities of matter. He stated that
1. All matter consists of invisible particles called atoms
2. Atoms are indestructible
3. Atoms are solid but invisible
4. Atoms are homogeneous
5. Atoms differ in size, shape, mass, position, and arrangement.
Hence, option $$D$$ is correct.
Question 10
1 / -0

Which of the following is a postulate of Dalton's atomic theory?

A
All matter consists of indivisible particles called atoms.

B
The atom is the smallest unit of matter that can take part in a chemical reaction.

C
Atoms of the same element can combine in the same ratio to form compounds.

D
All of the above

Solution

Postulates of Dalton's atomic theory:
(i) All matter consists of indivisible particles called atoms.
(ii) Atoms of the same element are similar in shape and mass but differ from the atoms of the other elements.
(iii) Atoms can not be created or destroyed.
(iv) Atoms of different elements may combine in a fixed simple whole-number ratio to form compound atoms.
(v) Atoms of the same element can combine in the same ratio to form compounds.
(vi) Atoms are the smallest unit of matter that can take part in a chemical reaction.
So, option $$D$$ is correct.

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Atoms and Molecules Test - 49

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Atoms and Molecules Test - 49

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SHARING IS CARING

Question 1

142 u

129 u

137 u

132 u

Solution

Question 2

u/mole

g/mole

g/litre

None of above.

Solution

Question 3

molecules

compounds

allotropes

All of the above

Solution

Question 4

small, indivisible particles

large particles

large, divisible particles

None of above

Solution

Question 5

Aristotle

Democritus

Rutherford

Proust

Solution

Question 6

Dalton

Aristotle

Thomson

Chadwick

Solution

Question 7

Bohr

Dalton

Leucippus

Werner

Solution

Question 8

Democritus and Leucippus

Dalton and Rutherford

Einstein and Kanad

Democritus and Dalton

Solution

Question 9

atoms are homogeneous

atoms are indestructible

atoms are solid but invisible

all of the above

Solution

Question 10

All matter consists of indivisible particles called atoms.

The atom is the smallest unit of matter that can take part in a chemical reaction.

Atoms of the same element can combine in the same ratio to form compounds.

All of the above

Solution

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