Advertisements
Advertisements
प्रश्न
State why hydrogen is not prepared in the laboratory by the action of sodium with cold water.
Advertisements
उत्तर
As sodium is very reactive and reacts with water violently, darts on the surface of water and collection of hydrogen becomes difficult.
APPEARS IN
संबंधित प्रश्न
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
Water gas is a mixture of
Which metal is preferred for the preparation of hydrogen?
from acid?
For laboratory preparation of hydrogen, give the following:
fully-labeled diagram
Which test should be made before collecting hydrogen in a gas jar?
Choose the correct option:
Elements which show unique nature in the preparation of hydrogen are:
Complete and balance the following reaction.
Fe + H2O →_____________ +___________
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.
A white substance which leaves an amphoteric oxide as a residue [whose colour varies in the heated and in the cold state] and evolves a gas which turns lime water milky.
Give a reason for the following.
Granulated zinc is preferred to metallic zinc in the preparation of hydrogen using dilute acid.
