Unit 1 – Fundamentals of Chemistry

Question 1 of 13

1. Question

Industrial chemistry deals with the manufacturing of compounds:

the laboratory
on micro scale
on commercial scale
on economic scale

Question 2 of 13

2. Question

Which one of the following can be separated by physical means?

mixture
element
compound
radical

Question 3 of 13

3. Question

The most abundant element occurring in the oceans is:

oxygen
hydrogen
nitrogen
silicon

Question 4 of 13

4. Question

Which one of the following element is found in most abundance in the earth’s crust?

oxygen
aluminum
silicon
iron

Question 5 of 13

5. Question

The third abundant gas found in the atmosphere is:

carbon monoxide
oxygen
nitrogen
argon

Question 6 of 13

6. Question

One amu (atomic mass unit) is equivalent to:

1.66 x 10^-24 mg
1.66 x 10^-24 g
1.66 x 10^-21 g
1.66 x 10^-23 g

Question 7 of 13

7. Question

All of the followings are tri-atomic molecule except:

H₂
O₃
H₂O
CO₂

Question 8 of 13

8. Question

The mass of one molecule of water is:

18 amu
18 g
18 mg
18 kg

Question 9 of 13

9. Question

The molar mass of H₂S0₄ is

98 g
48 amu
4.8 g
98 amu

Question 10 of 13

10. Question

Molar mass is usually expressed in grams. Which one of the following is molar mass of O₂ in amu?

32 amu
53. 2 x 10-24 amu
1.92 x 10-25 amu
192.64 x 10-25 amu

Question 11 of 13

11. Question

How many numbers of moles are equivalent to 8 grams of CO₂?

0.15
0.18
0.21
0.24

Question 12 of 13

12. Question

Which one of the following pairs has the same number of ions?

1 mole of NaCl and 1 mole of MgCl₂
1/2 mole of NaCl and 1/2 mole of MgCl₂
1/2 mole of NaCl and 1/3 mole of MgCl₂
1/3 mole of NaCl and 1/2 mole of MgCl₂

Question 13 of 13

13. Question

Which one of the following pairs has the same mass?

1 mole of CO and 1 mole of N₂
1 mole of CO and 1 mole of CO₂
1 mole of O2 and 1 mole of N₂
1 mole of O2 and 1 mole of CO₂