WorksheetsPreparation of Gases Quiz
Total questions: 30
Worksheet time: 15mins
Which acid is commonly used to prepare hydrogen gas in the laboratory?
Sulfuric acid
Nitric acid
Acetic acid
Hydrochloric acid
What solid is used along with dilute hydrochloric acid to prepare hydrogen gas?
Zinc
Copper
Sodium
Iron
How is hydrogen gas collected during its preparation?
Downward delivery
Over water
Upward delivery
None of the above
Which of the following is a correct test for hydrogen gas?
Glowing splint relights
Limewater turns milky
Popping sound with a burning splint
Blue litmus turns red
Which gas turns moist red litmus paper blue?
Carbon dioxide
Oxygen
Ammonia
Hydrogen
Which chemicals are used to prepare oxygen gas?
Sodium hydroxide and ammonium chloride
Zinc and hydrochloric acid
Hydrogen peroxide and manganese dioxide
Calcium carbonate and hydrochloric acid
What is the role of manganese dioxide in the preparation of oxygen gas?
Reactant
Oxidizer
Catalyst
Precipitate
What color does red litmus paper turn in ammonia gas?
Red
Blue
No change
White
Carbon dioxide gas is tested using:
A burning splint
Glowing splint
Moist blue litmus
Limewater
Which gas supports combustion and relights a glowing splint?
Hydrogen
Oxygen
Carbon dioxide
Ammonia
Why is it dangerous to test ammonia gas by smelling it directly?
It has no odor
It can cause choking
It is flammable
It supports combustion
Which alternative test is safer than direct inhalation when identifying ammonia gas?
Using limewater
Using a glowing splint
Using moist red litmus paper
Using a thermometer
Why is oxygen collected over water in the laboratory?
It is soluble in water
It is denser than water
It is insoluble in water
It reacts with water
Why should the first jar of carbon dioxide not be collected?
It contains oxygen
It is impure or mixed with air
It is highly flammable
It is poisonous
Which of the following best explains the use of upward delivery for ammonia?
It is heavier than air
It is lighter than air
It dissolves in water
It reacts with air
Why is downward delivery used for collecting carbon dioxide?
It dissolves in water
It reacts with oxygen
It is denser than air
It is lighter than air
Which diagram would help students most during gas preparation?
A periodic table
A flowchart of lab rules
A labeled setup of the apparatus
A graph of gas volumes
Why is it helpful to combine the method and apparatus in one section of the presentation?
It shortens the lesson
It reduces material cost
It improves understanding of procedures
It adds more topics
The best reason to use diagrams in teaching gas collection is:
To decorate the slide
To replace reading
To enhance visualization and understanding
To make the file larger
What is one key safety precaution when preparing hydrogen gas?
Use in a dark room
Ensure no flame is nearby
Smell it directly
Use copper instead of zinc
What property of hydrogen makes it dangerous if not handled properly in the lab?
Toxicity
It supports combustion
Its flammability
Its density
Why must preparation of ammonia be done in a fume cupboard or well-ventilated area?
It is colorless
It is flammable
It is explosive
It is irritating to the nose and lungs
Why is a catalyst like manganese dioxide useful in gas preparation?
It reduces the reaction volume
It reacts with water
It increases the speed of the reaction
It neutralizes the acid
Which of the following gases can be collected by displacement of air?
Ammonia and oxygen
Carbon dioxide and oxygen
Hydrogen and carbon dioxide
All of them
If a gas is collected over water, what does this suggest about its solubility?
It is highly soluble in water
It is explosive in water
It is not soluble or slightly soluble in water
It changes color in water
Why is it dangerous to test hydrogen gas with a glowing splint instead of a burning one?
It will not react
It can cause backfire
It produces carbon dioxide
It dissolves quickly
Which apparatus is best for generating carbon dioxide in a lab?
Beaker and test tube
Flat-bottom flask, thistle funnel, and delivery tube
Funnel and syringe
Measuring cylinder
Which gas can be tested by observing the relighting of a glowing splint?
Hydrogen
Carbon dioxide
Oxygen
Ammonia
What is a safe way to prevent backflow of acid when preparing hydrogen gas?
Use a burner
Use a delivery tube below the acid level
Add more zinc
Stopper the flask tightly
What is the primary reason for including safety tips and visuals in gas preparation lessons?
To fill the slide
To entertain students
To ensure understanding and safety during experiments
To pass exams
