Some Basic Concepts of Chemistry Test

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Some Basic Concepts of Chemistry Test - 15

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Weekly Quiz Competition

Question 1
1 / -0

An organic compound contains $$C, H$$ and $$S$$. The minimum molecular weight of the compound containing $$8\%$$ sulphur is:

[atomic weight of $$S= 32\ amu$$]

A
$$200\ g$$ $$mol^{- 1}$$

B
$$400\ g$$ $$mol^{- 1}$$

C
$$300\ g$$ $$mol^{- 1}$$

D
$$600\ g$$ $$mol^{- 1}$$

Solution

$$8\%$$ S means 100 g of compound contains 8 g of S.

The atomic mass of S is 32 amu.

The minimum molecular weight of the organic compound will be

$$\displaystyle \dfrac {100 \times 32}{8} = 400 g/mol$$

Hence, the correct option is $$B$$.
Question 2
1 / -0

At same temperature and pressure, equal volumes of gases contain the same number of:

A
molecules

B
electrons

C
protons

D
particles

Solution

Avogadro's hypothesis: All gases containing equal moles if substance occupy the same volume at the same temperature and pressure.

Hence, equal volumes of gases will have an equal number of particles that can be atoms or molecules.
Question 3
1 / -0

Which of the following property of an element never changes?

A
Valency

B
Atomic weight

C
Both A and B

D
None of the above

Solution

The atomic weight is a characteristic property of an element and can never vary.

The valency of an element can vary. For example, when the ion is in +2 and +3 oxidation state, its valency is 2 and 3 respectively.
Question 4
1 / -0

Which one of the following properties of an element is not variable?

A
Valency

B
Atomic weight

C
Equivalent weight

D
All of these

Solution

Atomic weight is specific for a particular element and does not change under any circumstances.
Question 5
1 / -0

According to the Avogadro's Law, equal volumes of two different gases, under same conditions of temperature and pressure, contain equal number of:

A
atoms

B
molecules

C
electrons

D
protons

Solution

Avogadro's Law states that equal volumes of two different gases, under the same conditions of temperature and pressure, contain an equal number of molecules.
Question 6
1 / -0

Equal volume of gases contain equal number of moles.
State whether the above statement is true or false.

A
The statement is True

B
The statement is False

C
Neither

D
Equal volume of gases contain equal number of moles, only when the temperature is increased

Solution

Avogadro's Law states that at the same temperature and pressure, equal volumes of different gases contain an equal number of particles.
Question 7
1 / -0

The value of 1 amu is equal to:

A
$$1.66\times 10^{-8}g$$

B
$$1.66\times 10^{-4}g$$

C
$$1.66\times 10^{-16}g$$

D
$$1.66\times 10^{-24}g$$

Solution

One an amu is $$\dfrac{1}{12}$$ of the mass of one carbon-12 atom.

It is equal to $$ \dfrac{1}{N_A} $$

$$= \dfrac{1}{6.022\times10^{23}} = 1.66 \times 10^{-24} g$$.
Question 8
1 / -0

Avogadro's law finds an application in the determination of:

A
Atomicity of gas

B
Molecular weights of gases

C
Molecular formula of certain gaseous compounds

D
All the above

Solution

Avogadro's law finds an application in the determination of molecular weights of gases.
Question 9
1 / -0

Which of the following is used as standard for determination of atomic mass unit?

A
$$O^{16}$$

B
$$C^{12}$$

C
$$H^{1}$$

D
$$O^{17}$$

Solution

Atomic mass of a compound is measured in atomic mass units abbreviated as amu or u. One atomic mass unit is defined as $$\frac{1}{12}^{th}$$ of mass of a single carbon-12 atom.
Question 10
1 / -0

Which gas law relates the volume of a gas to the number of molecules of the gas?

A
Gay-Lussac's Law

B
Avogadro's Law

C
Boyle's Law

D
Charle's Law

Solution

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

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Re-Attempt Weekly Quiz Competition

Some Basic Concepts of Chemistry Test - 15

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Some Basic Concepts of Chemistry Test - 15

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SHARING IS CARING

Question 1

$$200\ g$$ $$mol^{- 1}$$

$$400\ g$$ $$mol^{- 1}$$

$$300\ g$$ $$mol^{- 1}$$

$$600\ g$$ $$mol^{- 1}$$

Solution

Question 2

molecules

electrons

protons

particles

Solution

Question 3

Valency

Atomic weight

Both A and B

None of the above

Solution

Question 4

Valency

Atomic weight

Equivalent weight

All of these

Solution

Question 5

atoms

molecules

electrons

protons

Solution

Question 6

The statement is True

The statement is False

Neither

Equal volume of gases contain equal number of moles, only when the temperature is increased

Solution

Question 7

$$1.66\times 10^{-8}g$$

$$1.66\times 10^{-4}g$$

$$1.66\times 10^{-16}g$$

$$1.66\times 10^{-24}g$$

Solution

Question 8

Atomicity of gas

Molecular weights of gases

Molecular formula of certain gaseous compounds

All the above

Solution

Question 9

$$O^{16}$$

$$C^{12}$$

$$H^{1}$$

$$O^{17}$$

Solution

Question 10

Gay-Lussac's Law

Avogadro's Law

Boyle's Law

Charle's Law

Solution

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