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प्रश्न
Write balanced equation of the reaction in the preparation of : hydrogen from a solution of potassium hydroxide [other than by electrolysis].
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उत्तर
Preparation of H2 from potassium hydroxide
\[\ce{2Al + 2KOH + 2H2O ->\underset{\text{Pot. meta aluminate}}{2KAlO2} + 3H2}\]
OR
\[\ce{Zn + 2KOH ->\underset{\text{[Potassium zincate]}}{K2ZnO2} + H2}\]
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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:
Helium replaced hydrogen in weather observation balloons?
Give a balanced chemical equation for the reaction.
MULTIPLE CHOICE QUESTIONS
The name hydrogen was given by
- Cavendish
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Give reason for the following:
The reaction of chlorine with hydrogen sulphide is deemed a redox reaction.
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Two jars of H2 are collected – “one burns quietly and the other does not”.
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?
