Some gases (CO2 and NH3)

Question 1:

What is a primary artificial source of carbon dioxide in the atmosphere?

• A. Photosynthesis


• B. Burning fossil fuels


• C. Volcanic eruption


• D. Decomposition of organic matter

Question 2:

How is carbon dioxide gas typically prepared in a laboratory setting?

• A. Mixing limestone with water


• B. Burning magnesium carbonate


• C. Reacting calcium carbonate with dilute hydrochloric acid


• D. Heating organic matter

Why does a burning matchstick extinguish when exposed to a jar containing carbon dioxide?

• A. Carbon dioxide is combustible


• B. Carbon dioxide is a supporter of combustion


• C. Carbon dioxide reacts with the matchstick


• D. Carbon dioxide neither supports nor undergoes combustion

What is the observable change in lime water when carbon dioxide is passed through it?

• A. It turns blue


• B. It becomes colorless


• C. It remains unchanged


• D. It changes to milky white

What is the primary chemical used in fire extinguishers that reacts with sodium bicarbonate to produce carbon dioxide?

 

• A. H2O

• B. H2SO4

• C. Na2SO4

• D. CO2

What happens when carbon dioxide reacts with red-hot coke at 900°C?

 

• A. Formation of carbonic acid

• B. Production of carbon monoxide

• C. Creation of carbohydrates

• D. Generation of oxygen

What is the primary weak acid formed from the reaction of carbon dioxide with water?

• B) Sulfuric acid (H2SO4)

• C) Carbonic acid (H2CO3)

• D) Nitric acid (HNO3)

• A) Hydrochloric acid (HCl)

What is the chemical reaction involved in the formation of the weak base NH4OH from ammonia (NH3)?

• A) 3NH3+O2→2NH4OH3NH3​+O2​→2NH4​OH

• B) 2NH3+H2O→NH4OH2NH3​+H2​O→NH4​OH

• C) 4NH3→NH4OH+NH4NO34NH3​→NH4​OH+NH4​NO3

• ​ D) NH3+CO2+H2O→NH4OHNH3​+CO2​+H2​O→NH4​OH

How is ammonia gas produced in nature when nitrogenous substances decay in the absence of oxygen?

 

• A. Formation from carbon dioxide

• B. Liberation from ammonium chloride

• C. Combination with oxygen

• D. Decomposition of nitrogenous substances

Which chemical reaction represents the combustion of ammonia in the presence of oxygen?

 

• A. 4NH3 (g) + 3O2 (g) → 6H2O (l) + 2N2 (g)

• B. NH3 (g) + H2O (l) → NH4OH(aq)

• C. 2NH3 (g) + 2Na (s) → 2NaNH2 (s) + H2(g)

• D. 4NH3 (g) + 5O2 (g) → 6H2O (l) + 2NO (g)