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प्रश्न
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.
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उत्तर १
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.
उत्तर २
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.
संबंधित प्रश्न
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:
A pop sound produced when hydrogen is burnt?
Multiple Choice Question
Equal volumes of hydrogen and chlorine are exposed to diffused sunlight to prepare
MULTIPLE CHOICE QUESTIONS
Which is the lightest of all elements?
- hydrogen
- helium
- lithium
- none of these
FILL IN THE BLANK
In nature, hydrogen occurs as a .................. molecule represented as H2
FILL IN THE BLANK
Ammonia is used to make ................
Why is hydrogen called a reducing agent? Give chemical equation to support your answer ?
Write the balanced equation and give your observation when the following metal reacts:
Sodium with cold water
Write the balanced equation and give your observation when the following metal reacts:
Calcium with cold water
Write the balanced equation and give your observation when the following metal reacts:
Magnesium with steam
Choose the correct option:
The composition of the nucleus of deuterium is
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.
Chlorine is ______ to HCl.
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:
Nitrogen to a basic gas – using hydrogen.
Give a chemical test to distinguish between the following gases:
Hydrogen and oxygen
Give a chemical test to distinguish between the following gases:
Ammonia and hydrogen chloride
Write a correctly balanced equation for the following “word equation”:
calcium + water → calcium hydroxide + hydrogen
Explain the following:
Two jars of H2 are collected – “one burns quietly and the other does not”.
Describe one chemical test applied to the following gases, which would enable you to distinguish between them :‘carbon monoxide and hydrogen’.
Write down the “word equation” for the following reaction:
sodium hydroxide solution + zinc → ?
Describe briefly, with equations, the Bosch Process for the large scale production of hydrogen.
Give a reason for the following.
A mixture of hydrogen and chlorine can be separated by passage through a porous pot.
Select the correct answer from the symbol in the bracket.
The element, which like hydrogen has one valence electron.
