Atoms and Molecules Test

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Atoms and Molecules Test - 48

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following is not a molecule?

A
$$O$$

B
$$O_2$$

C
$$CO_2$$

D
$$N_2$$

Solution

A molecule may be homonuclear, that is, it consists of atoms of a single chemical element, as with oxygen ($$O_2 \ or\ N_2$$), or, it may be heteronuclear, a chemical compound composed of more than one element, as with water ($$H_2O \ or \ CO_2$$). Out of all the options, $$O$$ represents a single oxygen atom and not a molecule.
Question 2
1 / -0

________ is the latin name for sodium.

A
Sodiumin

B
Natrium

C
Natrimium

D
Kalium

Solution

The chemical abbreviation for sodium atom is $$Na,$$ from its Latin name, $$Natrium$$.
Question 3
1 / -0

Formula unit mass for $$K_2CO_3$$ is :

A
140u

B
138u

C
120u

D
125u

Solution

Formula unit mass of $$K_2CO_3 =$$
$$ 2\times Atomic \ mass \ of \ K + 1 \times Atomic\ mass\ of\ C + 3\times Atomic\ mass\ of\ O $$
= $$ 2\times 39u + 1 \times 12u + 3\times 16u $$
= 138 u.
Question 4
1 / -0

Formula mass unit of $$Na_2CO_3.10H_2O$$ is :

A
290

B
286

C
180.02

D
105.97

Solution

Formula unit mass of $$Na_2CO_3$$
= $$ 2\times atomic\ mass\ of\ Na + 1\times atomic\ mass\ of\ C + 3\times atomic\ mass\ of\ O $$
$$= 2\times 22.98 + 1\times 12.01 + 3\times 16 $$
$$=105.97 u$$
Formula unit mass of $$10H_2O = 10\times atomic\ mass\ of\ H_2O $$
$$= 10\times 18.02$$
$$=180.02 u$$
Formula unit mass of $$Na_2CO_3.10H_2O = 105.97 + 180.02$$
$$= 285.99 u$$
Question 5
1 / -0

Formula unit mass of $$ ZnO$$ is :

A
$$85$$

B
$$90$$

C
$$81$$

D
$$89$$

Solution

Formula unit mass of $$ZnO$$ is
$$=(1\times atomic\ mass\ of\ Zn) + (1\times atomic\ mass\ of\ O) $$
$$= 1\times 65 + 1\times 16 $$
$$= 81 u.$$
Option $$C$$ is correct.
Question 6
1 / -0

What is the formula mass of $$Ba(HSO_3)_2$$?
Atomic mass of Ba is 137 u

A
299 u

B
250 u

C
290 u

D
260 u

Solution

Formula mass of $$Ba(HSO_3)_2$$

$$= 1\times atomic\ mass\ of\ Ba + 2\times atomic\ mass\ of\ H + 2\times atomic\ mass\ of\ S$$
$$\\\\\\\\\\ + 6\times atomic\ mass\ of\ O $$

$$= (1\times 137 + 2\times 1 + 2\times 32 + 6\times 16) $$ u

$$= (137 + 2 + 64 + 96)$$ u

$$=299$$ u

Hence, the correct option is $$A$$
Question 7
1 / -0

The formula unit mass of $$CuSO_4.5H_2O$$ is

A
159.62

B
90.10

C
249.72

D
240

Solution

Formula unit mass of $$CuSO_4 = 1\times Atomic\ mass\ of\ Cu + 1\times Atomic\ mass\ of\ S + 4\times Atomic\ mass\ of\ O $$
= $$ 1\times 63.55 + 1\times 32.07 + 4\times 16 $$ $$= 159.62\ u$$

Formula unit mass of 5 $$H_2O = 5\times Molecular\ mass\ of\ H_2O $$
= $$ 5\times 18 $$ $$= 90\ u$$

Formula unit mass of $$CuSO_4.5H_2O = 159.62 + 90 = 249.70\ u$$
Question 8
1 / -0

In which states of matter, the ions are more freely movable?

A
Solids

B
Liquids

C
Gas

D
All have same speed of ions.

Solution

The intermolecular force between ions is less in the case of the gaseous state of matter. So its ions are more freely movable in comparison to liquids and solids.
Question 9
1 / -0

Kanad called the tiniest of tiny particles of matter as:

A
Parman

B
Parmounu

C
Anu

D
Parmanu

Solution

One of the earliest attempts to understand the structure of matter was made by Maharishi Kanad, an Indian sage who lived around the $$6th$$ century BC. According to him, if the matter is broken into smaller and smaller pieces, a stage will come when the matter cannot be broken further. Kanad called these tiniest of tiny particles Parmanu.
Question 10
1 / -0

One atomic mass is equal to

A
$$1.66\times10^{-27}$$ g

B
$$1.66\times10^{-24}$$ g

C
$$1.66\times10^{-23}$$ g

D
$$1.66\times10^{-25}$$ g

Solution

One atomic mass unit is equal to $$1.66 \times 10^{-24} g.$$ It is equal to 1/12th of mass of atom of Carbon-12. It is abbreviated as $$\text{u.}$$

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Re-Attempt Weekly Quiz Competition

Atoms and Molecules Test - 48

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Atoms and Molecules Test - 48

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Question 1

$$O$$

$$O_2$$

$$CO_2$$

$$N_2$$

Solution

Question 2

Sodiumin

Natrium

Natrimium

Kalium

Solution

Question 3

140u

138u

120u

125u

Solution

Question 4

290

286

180.02

105.97

Solution

Question 5

$$85$$

$$90$$

$$81$$

$$89$$

Solution

Question 6

299 u

250 u

290 u

260 u

Solution

Question 7

159.62

90.10

249.72

240

Solution

Question 8

Solids

Liquids

Gas

All have same speed of ions.

Solution

Question 9

Parman

Parmounu

Anu

Parmanu

Solution

Question 10

$$1.66\times10^{-27}$$ g

$$1.66\times10^{-24}$$ g

$$1.66\times10^{-23}$$ g

$$1.66\times10^{-25}$$ g

Solution

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