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प्रश्न
Fill in the blank
Hydrogen reacts with metal oxides to form ............and....................
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उत्तर
Hydrogen reacts with metal oxides to form metal and water.
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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.
FILL IN THE BLANK
........................... means ‘maker of water’ in Greek.
Give reason for the following:
The end of the thistle funnel should be dipped under acid.
Hydrogen can be prepared with the help of cold water. Give a reaction of hydrogen with:
A monovalent metal
Complete and balance the following reaction.
Zn + H2O →_____________ +___________
Select the correct options for the following statement:
The acid _____ is not Used in the laboratory preparation of hydrogen, using zinc and an acid.
Select the correct options for the following statement:
A foul smelling gas formed when hydrogen reacts with a molten non-metal, is ___.
Complete and balance the equation:
[General method]
Reactions of active metals - cold water
Potassium- K + H2O → ______+ ______ [g]
Complete and balance the equation:
[General method]
Reactions of active metals - cold water
Sodium - 2Na + 2H2O → ______+ _______ [g]
Complete and balance the equation:
[General method]
Reactions of metals - alkali [conc. soln.]
Aluminium - 2Al + 2NaOH + 2H2O → ______ + _______ [g]
2Al + 2KOH + 2H2O → _____ + _____ [g]
