Some Basic Concepts of Chemistry Test

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Some Basic Concepts of Chemistry Test - 25

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Weekly Quiz Competition

Question 1
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Directions For Questions

Samples of $$O_2, CO $$ and $$ CO_2$$ under the same conditions of temperature and pressure contain the same number molecules represented by $$X$$. The molecules of oxygen occupy V liters and have a mass of 8 g under the same conditions of temperature and pressure.

...view full instructions

In answering the above questions, which law has been used? [C=12, N=14, O=16]

A
Avogadro's law

B
Mass balance

C
Equilibrium

D
All of the above

Solution

Avogadro's law states that, "equal volumes of all gases, at the same temperature and pressure, have the same number of molecules".
Question 2
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Directions For Questions

Samples of $$O_2, CO $$ and $$ CO_2$$ under the same conditions of temperature and pressure contain the same number molecules represented by $$X$$. The molecules of oxygen occupy V liters and have a mass of 8 g under the same conditions of temperature and pressure.

...view full instructions

What is the mass of $$CO_2$$ in grams?

A
11 gm

B
44 gm

C
22 gm

D
8 gm

Solution

Avogadro's law states that, "equal volumes of all gases, at the same temperature and pressure, have the same number of molecules".
Moles of $$O_2$$ $$=\dfrac{8}{32} = 0.25 $$
so mass of $$CO_2 = 44\times0.25 = 11 gm$$
Question 3
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The volume occupied by 53.5 g of $$ Cl_2$$ is :

A
15.76 litres

B
16.87 litres

C
18.65 litres

D
20 litres

Solution

One mole of a gaseous substance occupies $$22.4 \ L$$ sovolume occupied by $$53.5$$ g of $$Cl_2 = 53.5\times\dfrac{22.4}{71} = 16.87 \ L$$.
Question 4
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The gases chlorine, nitrogen, ammonia and sulphur dioxide are collected under the same conditions of temperature and pressure. If 20 litres of nitrogen contains 'x' no. of molecules, state the no. of molecules in 20 litres of ammonia.

A
x

B
x/2

C
x/4

D
2x

Solution

According to avagadro's law, equal volume of gases contains equal number of molecules. Therefore, 20 litres of ammonia will contain x number of molecule.
Question 5
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A vessel contains N molecules of oxygen at a certain temperature and pressure. How many molecules of sulphur dioxide can the vessel accommodate at the same temperature and pressure.

A
N

B
2N

C
N/2

D
4N

Solution

As both have same volume and according to avagadro's law, equal volume of gases contains equal molecules so sulphur dioxide contains N molecules.
Question 6
1 / -0

Directions For Questions

Samples of $$O_2, CO $$ and $$ CO_2$$ under the same conditions of temperature and pressure contain the same number molecules represented by $$X$$. The molecules of oxygen occupy V liters and have a mass of 8 g under the same conditions of temperature and pressure.

...view full instructions

What is the volume occupied by X molecules of $$N_2$$?

A
2V

B
4V

C
V/2

D
V

Solution

Avogadro's law states that, "equal volumes of all gases, at the same temperature and pressure, have the same number of molecules".
So, X molecules of of $$N_2$$ occupies V litre volume.
Question 7
1 / -0

Directions For Questions

Samples of $$O_2, CO $$ and $$ CO_2$$ under the same conditions of temperature and pressure contain the same number molecules represented by $$X$$. The molecules of oxygen occupy V liters and have a mass of 8 g under the same conditions of temperature and pressure.

...view full instructions

What is the volume occupied by $$3X$$ molecules of $$CO$$?

A
V

B
3V

C
V/3

D
6V

Solution

Avogadro's law states that, "equal volumes of all gases, at the same temperature and pressure, have the same number of molecules".
So, $$3X$$ molecules of $$CO$$ occupies $$3V$$ liter volume.
Question 8
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Sodium chloride ($$NaCl$$) reacts with silver nitrate ($$AgNO_3$$) to produce silver chloride ($$AgCl$$) and sodium nitrate ($$NaNO_3$$). The law which satisfies this equation is ___________________ .

A
conservation of mass

B
conservation of energy

C
newton's law

D
dalton's law

Solution

Reaction:

$$NaCl+AgNO_3 \rightarrow AgCl+NaNO_3$$

Mol : 1 mol 1 mol 1 mol 1 mol
Mass : 58.5 g 170 g 143.5 g 85 g

Total mass of reactants is equal to the total mass of products. This is the law of conservation of mass.
Question 9
1 / -0

A vessel contains X number of molecules of hydrogen gas at a certain temperature and pressure. Under the same conditions of temperature and pressure, how many molecules of nitrogen gas would be present in the same vessel?

A
2X

B
X

C
0.5X

D
3X

Solution

Avogadro's law states that, "equal volumes of all gases, at the same temperature and pressure, have the same number of molecules" so same volume of nitrogen will have X number of molecules.
Question 10
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Which of the following is a suitable example for illustrating the law of conservation of mass? (Atomic mass of O = 16 u; H = 1 u)

A
18g of water is formed by the combination of 16g oxygen with 2g of hydrogen.

B
18g of water in liquid state is obtained by heating 18g of ice.

C
18g of water is completely converted into vapour state on heating.

D
18g of water freezes at $$4^{o}C$$ to give same mass of ice.

Solution

According to law of conservation of mass
Mass of reactants $$=$$ Mass of products
$$H_2 + O_2\rightarrow 2H_2O$$
$$4 g$$ $$32 g$$ $$36 g$$
$$2 g$$ $$16 g$$ $$18 g$$
$$2g + 16g = 18 g$$
Therefore, correct option is $$A$$.

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Re-Attempt Weekly Quiz Competition

Some Basic Concepts of Chemistry Test - 25

Result

Some Basic Concepts of Chemistry Test - 25

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SHARING IS CARING

Question 1

Avogadro's law

Mass balance

Equilibrium

All of the above

Solution

Question 2

11 gm

44 gm

22 gm

8 gm

Solution

Question 3

15.76 litres

16.87 litres

18.65 litres

20 litres

Solution

Question 4

x

x/2

x/4

2x

Solution

Question 5

N

2N

N/2

4N

Solution

Question 6

2V

4V

V/2

V

Solution

Question 7

V

3V

V/3

6V

Solution

Question 8

conservation of mass

conservation of energy

newton's law

dalton's law

Solution

Question 9

2X

X

0.5X

3X

Solution

Question 10

18g of water is formed by the combination of 16g oxygen with 2g of hydrogen.

18g of water in liquid state is obtained by heating 18g of ice.

18g of water is completely converted into vapour state on heating.

18g of water freezes at $$4^{o}C$$ to give same mass of ice.

Solution

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