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प्रश्न
Multiple Choice Question
The metal which reacts with cold water to produce hydrogen is
विकल्प
magnesium
aluminium
calcium
iron
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उत्तर
calcium
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संबंधित प्रश्न
Fill in the blank
Hydrogen reacts with metal oxides to form ............and....................
FILL IN THE BLANK
........................... means ‘maker of water’ in Greek.
Give reason for the following:
Dilute sulphuric acid cannot be replaced by concentrated acid in the preparation of hydrogen.
Hydrogen may be prepared in the laboratory by the action of a metal on an acid.
How would you modify your apparatus to collect dry hydrogen? Which drying agent would you employ for this purpose?
Why are the following metals not used in the lab. preparation of hydrogen?
sodium
‘Hydrogen is obtained by electrolysis of acidified water’.
Answer the following pertaining to the preparation of hydrogen by electrolysis,
Name the electrode –
- through which the current enters the electrolyte.
- at which hydrogen is liberated.
Starting from hydrogen gas how would you obtain a basic gas.
Name an element whsich reacts violently with water at room temperature.
State why hydrogen is not prepared in the laboratory by the action of sodium with cold water.
Give a balanced equation for the following conversion.
\[\ce{KAlO2<-KOH->K2ZnO2}\]
