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प्रश्न
Fill in the blank
Hydrogen is ..................... than air.
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उत्तर
Hydrogen is lighter than air.
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संबंधित प्रश्न
Give reason for the following:
Though hydrogen is lighter than air it cannot be collected by downward displacement of air.
Which metal is preferred for the preparation of hydrogen?
from acid?
Why are the following metals not used in the lab. preparation of hydrogen?
sodium
Complete and balance the following reaction.
Ca + H2O →_____________ +___________
Complete and balance the following reaction.
Fe + HCl →_____________ +___________
Select the correct options for the following statement:
The metal used as a catalyst in hydrogenation of oils.
Complete and balance the equation:
[General method]
Reactions of metals with dilute acids
Iron - Fe + 2HCl → ______ + _______ [g]
Complete and balance the equation:
[General method]
Reactions of metals - alkali [conc. soln.]
Zinc - Zn + 2NaOH → ______ + _______ [g]
Zn + 2KOH → ____ + _____ [g]
Name an element whsich reacts violently with water at room temperature.
State the electronic configuration of hydrogen [at. no. 1].e
Give a reason why hydrogen can be placed in group 1 [1A] and group 17 [VIIA] of the periodic table.
