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प्रश्न
Which test should be made before collecting hydrogen in a gas jar?
उत्तर
Test: Collect some amount of gas in a test tube and take it to a flame.
If the gas burns quietly, then there is no more air in the flask.
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संबंधित प्रश्न
For laboratory preparation of hydrogen, give the following:
method of collection
Give reason for the following:
The end of the thistle funnel should be dipped under acid.
Why are the following metals not used in the lab. preparation of hydrogen?
sodium
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]
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.
Water
Select the correct answer to the reactant added, to give the product in the preparation of hydrogen gas.
\[\ce{Al2(SO4)3 + H2}\]
Select the correct answer to the reactant added, to give the product in the preparation of hydrogen gas.
\[\ce{NaAlO2 + H2}\]
Give a balanced equation for the following conversion.
\[\ce{NH3<-H2->H2S}\]
