Advertisements
Advertisements
Questions
Give a test to differentiate between two gas jars – one containing pure hydrogen and the other hydrogen-air mixture.
Compare the combustibility of –
(a) pure hydrogen
(b) hydrogen-air mixture.
Advertisements
Solution 1
When a burning splinter is brought near the gas jar containing, pure H2 bums with pale blue flame quietly.
H2 + Oxygen mixture bums with explosion.
Solution 2
Combustibility of :
(a) Pure hydrogen: Bums quietly in air with a pale blue flame forming water
2H2 + O2 → 2H2O
(b) Hydrogen air mixture: It explodes on burning.
RELATED QUESTIONS
Indicate which of the following statement is true and which is false:
The hydrogen molecule is monovalent.
Hydrogen is combustible as well as a supporter of combustion.
Complete and balance the following equation:
H2+____________→ 2HCI
Give reason for the following:
Helium replaced hydrogen in weather observation balloons?
Give a balanced chemical equation for the reaction.
Multiple Choice Question
Hydrogen is responsible for producing
Write the balanced equation and give your observation when the following metal reacts:
Calcium with cold water
Correct the following statement:
Hydrogen is dried by passing it through conc. H2SO4.
Using a burning candle and a jar of hydrogen – how would you prove experimentally that Hydrogen is a combustible gas.
Using a burning candle and a jar of hydrogen – how would you prove experimentally that Hydrogen does not support combustion.
With reference to the equation : Cl2 + H2S → 2HCl + S pertaining to a redox reaction – select the correct answer.
Hydrogen sulphide is ______ to sulphur since the reaction involves ______ of hydrogen.
With reference to the equation : Cl2 + H2S → 2HCl + S pertaining to a redox reaction – select the correct answer.
Chlorine acts as an ______ agent.
Give balanced equation for the following conversion:
Water gas to hydrogen – industrially.
Give balanced equation for the following conversion:
Nitrogen to a basic gas – using hydrogen.
Give reason for the following:
The reaction of chlorine with hydrogen sulphide is deemed a redox reaction.
Give a chemical test to distinguish between the following gases:
Hydrogen and oxygen
Write a correctly balanced equation for the following “word equation”:
calcium + water → calcium hydroxide + hydrogen
Write balanced equation for the following reaction:
magnesium + dil. hydrochloric acid → ___
Name a gas which burns in air or oxygen forming water.
Write correctly the balanced equation for the following:
‘When zinc filings are added to a concentrated solution of sodium hydroxide’.
Describe one chemical test applied to the following gases, which would enable you to distinguish between them :‘carbon monoxide and hydrogen’.
What do you observe when a piece of sodium is dropped into cold water?
How would you obtain ‘hydrogen from sodium hydroxide’ solution other than by electrolysis?
Complete and balance the following equations:
Al + NaOH + ____ → ____ + ____
What do the following symbols represent : 2H and H2.
Describe briefly, with equations, the Bosch Process for the large scale production of hydrogen.
Give balanced equation for obtaining hydrogen from cold water using a divalent active metal.
