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प्रश्न
Why are the following metals not used in the lab. preparation of hydrogen?
sodium
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उत्तर
Sodium reacts violently with acid.
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संबंधित प्रश्न
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........................... means ‘maker of water’ in Greek.
TRUE \ FALSE
reacts with hot water to form copper oxide and hydrogen.
Complete the following word equation:
Sodium hydroxide + zinc → 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:
Complete and balance the following reaction.
Ca + H2O →_____________ +___________
Complete and balance the following reaction.
Zn + HCl →_____________ +___________
Complete and balance the equation:
[General method]
Reactions of metals - alkali [conc. soln.]
Zinc - Zn + 2NaOH → ______ + _______ [g]
Zn + 2KOH → ____ + _____ [g]
State why hydrogen is not prepared in the laboratory by the action of sodium with cold water.
State the reactant added to hydrogen to obtain the respective product in following case.
Hydrogen chloride
