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प्रश्न
Distinguish by heating the following in dry test tubs.
Ammonium Chloride and iodine.
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उत्तर
| Ammonium Chloride | Iodine | |
| Residue left | No residue | No residue |
| Colour of residue | The colour of the residue is white sublimate. | The colour of the residue is Violet sublimate. |
| Gas produced | Hydrogen chloride and ammonia gas are produced.(HCl + NH3) | Iodine vapours are produced. |
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संबंधित प्रश्न
FILL IN THE BLANK
On reaction with sulphuric acid solution, barium chloride forms a white precipitate of ........ sulphate.
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 |
Define electrolysis.
Fill in the blank
A new substance is formed in a _______ change.
Fill in the blank:
The basic conditions necessary for a chemical reaction is _______
Explain by writing a word equation.
Limestone powder disappears on adding to dilute hydrochloric acids.
Give an example of the following chemical changes.
A reaction where colour change is noticed.
What do you observe when Cobalt chloride paper is introduced in water vapour.
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