Some Basic Concepts of Chemistry Test

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Some Basic Concepts of Chemistry Test - 16

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Weekly Quiz Competition

Question 1
1 / -0

The mass number of sulfur atom is:

(Given: Atomic number = 16 and number of neutrons = 16)

A
18

B
32

C
24

D
16

Solution

Atomic number = number of protons = $$16$$

Mass number = Number of protons + number of neutrons

So the mass number of sulfur = $$32$$
Question 2
1 / -0

Which is the lightest element in the universe?

A
Helium

B
Hydrogen

C
Nitrogen

D
Silicon

Solution

$$\text {Hydrogen}$$ is the lightest element in the universe with atomic number $$1$$ and so, it has the simplest atomic structure.
Question 3
1 / -0

The law of conservation of mass was given by :

A
Dalton

B
Proust

C
Lavoisier

D
Berzelius

Solution

The law of conservation of mass was given by Lavoisier.
The Law of Conservation of Mass states that matter can be changed from one form into another, mixtures can be separated or made, and pure substances can be decomposed, but the total amount of mass remains constant.

We can state this important law in another way. The total mass of the universe is constant within measurable limits; whenever matter undergoes a change, the total mass of the products of the change is, within measurable limits, the same as the total mass of the reactants.
Question 4
1 / -0

Mass of atom expressed in atomic mass unit is :

A
Atomic mass

B
Molecular mass

C
Atomic number

D
None of the above

Solution

The mass of an atom expressed in amu is known as atomic mass. atomic mass unit defined as a unit of mass used to express atomic and molecular weights, equal to one-twelfth of the mass of an atom of carbon-12.
Question 5
1 / -0

What is the atomic mass (u) of calcium?

A
10

B
20

C
30

D
40

Solution

Atomic mass (u) of Calcium is 40 u.

Hence, the correct option is $$\text{D}$$
Question 6
1 / -0

A device for measuring temperatures at a distance is:

A
gas thermometer

B
mercury thermometer

C
radiation pyrometer

D
maximum-minimum thermometer

Solution

Radiation thermometers have the potential to measure an object's temperature at a distance. They can also measure temperatures faster than by other methods
Question 7
1 / -0

One a.m.u is defined as mass of :

A
$$\frac{1}{16}^{th}$$ mass of one oxygen atom

B
$$\frac{1}{14}^{th}$$ mass of one atom of nitrogen

C
$$\frac{1}{12}^{th}$$ mass of one carbon-12 atom

D
None of above

Solution

One a.m.u. is defined as mass of $$\frac1{12}^{th}$$ the mass of one carbon-12 atom.
Question 8
1 / -0

India's uranium supply comes mainly from the Jaduguda mines in:

A
Bihar

B
Madhya Pradesh

C
Maharashtra

D
None of these

Solution
Question 9
1 / -0

Which of the following expression of concentration of a solution is independent of temperature?

A
$$Molarity$$

B
$$Normality$$

C
$$Formality$$

D
$$Molality$$

Solution

$$Molality =\dfrac{number\ of \ moles\ of \ solute}{mass\ of\ solvent \ in \ kilograms}$$

Since mass is unaffected by the change in temperature, hence molality is independent of temperature.

Hence, the correct option is $$D$$
Question 10
1 / -0

Who laid the foundation of chemical sciences by experimentally establishing laws of chemical combination along with other scientists?

A
Proust

B
Antoine Lavoisier

C
Dalton

D
None of the above

Solution

Lavoisier was the first one who established important laws of chemical combination.

Hence, the correct option is B.

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Some Basic Concepts of Chemistry Test - 16

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Some Basic Concepts of Chemistry Test - 16

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Question 1

18

32

24

16

Solution

Question 2

Helium

Hydrogen

Nitrogen

Silicon

Solution

Question 3

Dalton

Proust

Lavoisier

Berzelius

Solution

Question 4

Atomic mass

Molecular mass

Atomic number

None of the above

Solution

Question 5

10

20

30

40

Solution

Question 6

gas thermometer

mercury thermometer

radiation pyrometer

maximum-minimum thermometer

Solution

Question 7

$$\frac{1}{16}^{th}$$ mass of one oxygen atom

$$\frac{1}{14}^{th}$$ mass of one atom of nitrogen

$$\frac{1}{12}^{th}$$ mass of one carbon-12 atom

None of above

Solution

Question 8

Bihar

Madhya Pradesh

Maharashtra

None of these

Solution

Question 9

$$Molarity$$

$$Normality$$

$$Formality$$

$$Molality$$

Solution

Question 10

Proust

Antoine Lavoisier

Dalton

None of the above

Solution

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