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प्रश्न
Explain the following:
Two jars of H2 are collected – “one burns quietly and the other does not”.
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उत्तर
‘One burn quietly’ is pure hydrogen, and ‘which does not bum quietly’ is mixed hydrogen with air. It explodes on burning.
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संबंधित प्रश्न
Indicate which of the following statement is true and which is false:
Hydrogen gas is easily liquefiable.
Give reason for the following:
A pop sound produced when hydrogen is burnt?
Give a balanced chemical equation for the reaction.
State four uses of hydrogen:
Multiple Choice Question
Hydrogen is responsible for producing
MULTIPLE CHOICE QUESTIONS
The name hydrogen was given by
- Cavendish
- Lavoisier
- Haber
- none of these
FILL IN THE BLANK
The compounds of carbon and hydrogen are called .................
Write the balanced equation and give your observation when the following metal reacts:
Sodium 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 does not support combustion.
Give a test to differentiate between two gas jars – one containing pure hydrogen and the other hydrogen-air mixture.
Write a correctly balanced equation for the following “word equation”:
calcium + water → calcium hydroxide + hydrogen
How can you obtain hydrogen from sodium hydroxide [not by electrolysis].
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’.
Write down the “word equation” for the following reaction:
sodium hydroxide solution + zinc → ?
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.
