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Question
For laboratory preparation of hydrogen, give the following:
fully-labeled diagram
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Solution
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In electrolysis of water, dilute sulphuric acid is added to increase ..................of water.
TRUE \ FALSE
reacts with hot water to form copper oxide and hydrogen.
Give a reason for the following:
Zinc granules are used in the lab preparation of hydrogen.
Give reason for the following:
Purified and dried hydrogen is collected over mercury.
Choose the correct option:
Elements which show unique nature in the preparation of hydrogen are:
How did the name 'hydrogen' originate?
Give reason:
A candle brought near the mouth of a jar containing hydrogen gas starts burning but is extinguished when pushed inside the jar.
Complete and balance the equation:
[General method]
Reactions of metals with steam
Magnesium - Mg + H2O → ______+ _______ [g]
Complete and balance the equation:
[General method]
Reactions of metals - alkali [conc. soln.]
Zinc - Zn + 2NaOH → ______ + _______ [g]
Zn + 2KOH → ____ + _____ [g]
Account for the following fact:
Potassium and sodium are not used to react with dilute ‘hydrochloric acid or dilute sulphuric acid in the laboratory preparation of hydrogen.
