Molecules Of Compounds-Multiple Choice Questions Quiz

Question 1: What is the chemical formula of water?

(a) H
(b) O2
(c) H2O
(d) CO2

Question 2: Which gas is responsible for the characteristic smell of rotten eggs?

(a) Oxygen (O2)
(b) Carbon dioxide (CO2)
(c) Hydrogen (H2)
(d) Hydrogen sulfide (H2S)

Question 3: What is the chemical formula of table salt (sodium chloride)?

(a) Na2Cl
(b) NaCl
(c) HCl
(d) NaOH

Question 4: Which molecule is known as the 'universal solvent'?

(a) H2O
(b) CO2
(c) NH3
(d) HCl

Question 5: Which gas is essential for photosynthesis in plants?

(a) Oxygen (O2)
(b) Carbon dioxide (CO2)
(c) Nitrogen (N2)
(d) Helium (He)

Question 6: Which molecule is responsible for carrying oxygen in our red blood cells?

(a) Carbon dioxide (CO2)
(b) Hemoglobin
(c) Glucose
(d) Water (H2O)

Question 7: What is the chemical formula of methane, the main component of natural gas?

(a) CH4
(b) C2H6
(c) CO2
(d) H2O

Question 8: Which gas gives a distinct 'popping' sound when a burning splinter is introduced?

(a) Oxygen (O2)
(b) Carbon monoxide (CO)
(c) Hydrogen (H2)
(d) Nitrogen (N2)

Question 9: Which compound is responsible for the sour taste of citrus fruits?

(a) Glucose
(b) Lactic acid
(c) Citric acid
(d) Acetic acid

Question 10: Which molecule is composed of three oxygen atoms and is responsible for protecting us from the Sun's harmful UV radiation?

(a) Ozone (O3)
(b) Carbon dioxide (CO2)
(c) Oxygen (O2)
(d) Methane (CH4)

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Total score: /10

Answer key:

Question 1: c

Question 2: d

Question 3: b

Question 4: a

Question 5: b

Question 6: b

Question 7: a

Question 8: c

Question 9: c

Question 10: a