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Question
Complete and balance the equation:
[General method]
Reactions of active metals - cold water
Potassium- K + H2O → ______+ ______ [g]
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Solution
\[\ce{2K + 2H2O -> 2KOH + H2}\] [g]
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RELATED QUESTIONS
Fill in the blank
Hydrogen reacts with metal oxides to form ............and....................
Match the statements in Column A with those in Column B.
| Column A | Column B |
|
1. A metal which reacts with cold water to from hydrogen. |
1. Reduction |
| 2. A gas which is inflammable and non-supporter of combustion | 2. Hydrogenation |
|
3. A process in which vanspati ghee is prepared from vegitable oils |
3. oxidation |
|
4. The removal ofhydrogen or addition of oxygen |
4. sodium |
| 5. The addition of hydrogen or removal of oxygen | 5. Hydrogen |
Multiple Choice Question
The metal which reacts with cold water to produce hydrogen is
Hydrogen may be prepared in the laboratory by the action of a metal on an acid.
How would you modify your apparatus to collect dry hydrogen? Which drying agent would you employ for this purpose?
Why are the following metals not used in the lab. preparation of hydrogen?
sodium
Complete and balance the following reaction.
Zn + H2O →_____________ +___________
Give reason for the following:
In the preparation of hydrogen by electrolysis of water – the distilled water used is acidified.
On heating which of the following substances i.e. copper carbonate, zinc carbonate, washing soda, copper sulphate, zinc nitrate, copper nitrate, lead nitrate, ammonium chloride and ammonium dichromate – relate to the reaction given below.
An efflorescent substance which leaves a residue having the same colour as the substance and evolves a gas which changes the colour of cobalt chloride paper.
How did the name ‘hydrogen’ originate? How does hydrogen occur in the combined state?
State the reactant added to hydrogen to obtain the respective product in following case.
Hydrogen sulphide
