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प्रश्न
Complete the table given below.
| Addition of dil. H2SO4 to FeS | Odour of gas evolved |
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उत्तर
| Addition of dil. H2SO4 to FeS | Odour of gas evolved | Rotten eggs (H2S Hydrogen sulphide) |
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संबंधित प्रश्न
The gas we use in the kitchen is called liquefied petroleum gas (LPG). In the cylinder, it exists as a liquid. When it comes out from the cylinder it becomes a gas (Change − A), then it burns (Change − B). The following statements pertain to these changes. Choose the correct one.
FILL IN THE BLANK
A .............. change is a temporary change.
MATCH THE COLUMNS
| 1 . `H_2` + `CI_2` `→` 2HCI | a. displacement reaction |
| 2. `2FeCI_3`+ `H_2` `→` `2FeCI_2` +2HCI` | b. addition of an electronegative redical |
| 3. Fe + `CuSO_4` `→``FeSO_4` +Cu` | c. removal of an electronegative redical |
| 4. `2H_2O` +`4NO_2`+`O_2` `→` `4HNO_3` | d.reduction by adding hydrogen |
| 5. 3Fe +`3CI_2` `→` `2FeCI_3` | e.electrolysis of water |
| 6. `FeCI_3`+ 3NaOH `→``Fe(OH)_3``↓`+NaCI | F.double decomposition,precipitation reaction |
| 7.`2H_2O` `→` `2H_2``↑`+`O_2` | e. combination or synthesis reaction |
Fill in the blank:
The basic conditions necessary for a chemical reaction is _______
Balance the following equation :
Fe + H2O → Fe3O4 + H2
Explain the following reaction with one suitable example of Double decomposition reaction.
Give reason for the following:
Colourless concentrated sulphuric acid in a test tube changes to blue on adding a small piece of copper to it.
Multiple choice:
Which of the following is not a characteristic of a chemical change?
Write your observation and a balanced equation in the case of the following substances being heated.
Copper nitrate.
What kind of a change is associated with decaying of a plants?
