Atoms and Molecules Test

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Atoms and Molecules Test - 11

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Weekly Quiz Competition

Question 1
1 / -0

Calculate the number of moles in 17 g of hydrogen peroxide (H₂O₂)

A
1 mole

B
2 mole

C
3 mole

D
1/2 mole

Solution

Molecular mass of H₂O₂is 34 u. So, 34 g of hydrogen peroxide will contain 1 moles. Therefore, 17 g of hydrogen peroxide will contain 17/34 moles or 1/2mole.
Question 2
1 / -0

What weight of Calcium contains the same number of atoms as are present in 2 g of Sulphur?

A
8 g

B
4 g

C
32 g

D
16 g

Solution

Number of moles present in 2 g of Sulphur = 2/32 = 0.0625 moles. Atomic mass of Calcium is 40 u. Mass of Calcium containing 0.0625 moles of atoms = 0.0625 × 40 = 8g.
Question 3
1 / -0

Which has more molecules - 4 g of methane or 11 g of CO₂ ?

A
Methane

B
CO₂

C
Both have the same number of moles.

D
Information not sufficient

Solution

4 g of methane will contain 4/16 moles of molecules = 0.25 moles

11 g of CO₂ will contain 11/44 moles = 0.25 moles. Hence, both will contain an equal number of moles and an equal number of molecules.
Question 4
1 / -0

One mole of N₂ is equal to _________.

A
20 grams of Nitrogen

B
14 g of Nitrogen

C
6.022 × 10²³N₂molecules

D
14 g of Nitrogen

Solution

One mole of N₂ is equal to 28 g of nitrogen or 6.022 × 10²³ molecules.
Question 5
1 / -0

Which of the following two statement(s) is/are true?

Statement A : Mole is quite often known as chemist's dozen.

Statement B : The mass of one-twelfth (1/12) of the mass of one atom of Carbon is taken as 1 u.

A
Statement A

B
Statement B

C
Both the statements - A and B

D
Neither Statement A nor Statement B.

Solution

Both the statements are correct. A mole is also known as a chemist's dozen. A mole, just like a dozen, is a common counting unit. A counting unit is a convenient number that makes it easier to count objects. The mass of one-twelfth of the mass of one atom of Carbon is taken as 1 u.
Question 6
1 / -0

How many molecules are present in one gram molecular mass of a substance?

A
1/6.022 × 10²³ molecules

B
6.022 × 10²³ molecules

C
3.012 × 10²³ atoms

D
2.3 atoms

Solution

Gram molecular mass is the mass in grams of one mole of a molecular substance. One mole contains 6.022 × 10²³ molecules. This is known as Avogadro number. Therefore, one gram molecular mass of a substance has 6.022 × 10²³ molecules.
Question 7
1 / -0

The atomic mass of calcium is 40. The number of moles in 60 g of Calcium are:

A
1.5 mol

B
0.75 mol

C
0.5 mol

D
2.0 mol

Solution

Number of moles in 60 g of Calcium = Given mass of Calcium / Atomic mass of Calcium = 60/40 = 1.5 mol
Question 8
1 / -0

Match the following with the correct response:

(1) Nitrate (A) P³⁻

(2) Phosphide (B) PO₄³⁻

(3) Nitrite (C) NO₂⁻

(4) Phosphate (D) NO₃⁻

A
1-C, 2-B, 3-D, 4-A

B
1-A, 2-C, 3-B, 4-D

C
1-D, 2-A, 3-C, 4-B

D
1-B, 2-D, 3-A, 4-C

Solution

(1) Nitrate (D) NO₃⁻

(2) Phosphide (A) P³⁻

(3) Nitrite (C) NO₂⁻

(4) Phosphate (B) PO₄³⁻

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(1) Nitrate	(A) P³⁻
(2) Phosphide	(B) PO₄³⁻
(3) Nitrite	(C) NO₂⁻
(4) Phosphate	(D) NO₃⁻

Atoms and Molecules Test - 11

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Atoms and Molecules Test - 11

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Question 1

1 mole

2 mole

3 mole

1/2 mole

Solution

Question 2

8 g

4 g

32 g

16 g

Solution

Question 3

Methane

CO2

Both have the same number of moles.

Information not sufficient

Solution

Question 4

20 grams of Nitrogen

14 g of Nitrogen

6.022 × 1023 N2 molecules

14 g of Nitrogen

Solution

Question 5

Statement A

Statement B

Both the statements - A and B

Neither Statement A nor Statement B.

Solution

Question 6

1/6.022 × 1023 molecules

6.022 × 1023 molecules

3.012 × 1023 atoms

2.3 atoms

Solution

Question 7

1.5 mol

0.75 mol

0.5 mol

2.0 mol

Solution

Question 8

1-C, 2-B, 3-D, 4-A

1-A, 2-C, 3-B, 4-D

1-D, 2-A, 3-C, 4-B

1-B, 2-D, 3-A, 4-C

Solution

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CO₂

6.022 × 10²³N₂molecules

1/6.022 × 10²³ molecules

6.022 × 10²³ molecules

3.012 × 10²³ atoms