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प्रश्न
Why are the following metals not used in the lab preparation of hydrogen?
calcium
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उत्तर
Calcium is expensive.
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संबंधित प्रश्न
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........................... means ‘maker of water’ in Greek.
For laboratory preparation of hydrogen, give the following:
fully-labeled diagram
Hydrogen can be prepared with the help of cold water. Give a reaction of hydrogen with:
A divalent metal
Why are the following metal not used in the lab. preparation of hydrogen?
iron
Why are the following metals not used in the lab. preparation of hydrogen?
sodium
State how hydrogen occurs in the free state. Name three compounds containing hydrogen in the combined state.
Select the correct options for the following statement:
A metal which reacts with water to give a metallic hydroxide & liberate hydrogen.
Select the correct options for the following statement:
The metal which reacts with steam liberating hydrogen & the reaction is reversible.
Complete and balance the equation:
[General method]
Reactions of active metals - cold water
Calcium - Ca + H2O → ______+ _______ [g]
Complete and balance the equation:
[General method]
Reactions of metals - alkali [conc. soln.]
Zinc - Zn + 2NaOH → ______ + _______ [g]
Zn + 2KOH → ____ + _____ [g]
