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प्रश्न
Match the pairs.
| a. | Photosynthesis | i. | Tendency to lose electrons |
| b. | Water | ii. | Reactant in combustion process |
| c. | Sodium chloride | iii. | Chemical change |
| d. | Dissolution of salt in water | iv. | Covalent bond |
| e. | Carbon | v. | Ionic bond |
| f. | Fluorine | vi. | Physical change |
| g. | Magnesium | vii. | Tendency to form anion |
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उत्तर
| a. | Photosynthesis | iii. | Chemical change |
| b. | Water | iv. | Covalent bond |
| c. | Sodium chloride | v. | Ionic bond |
| d. | Dissolution of salt in water | vi. | Physical change |
| e. | Carbon | ii. | Reactant in combustion process |
| f. | Fluorine | vii. | Tendency to form anion |
| g. | Magnesium | i. | Tendency to lose electrons |
संबंधित प्रश्न
FILL IN THE BLANK
Distillation is a method of obtaining pure ............. from a solution.
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 substances formed as a result of a chemical reaction are called _______
Give reason for the following:
Silver nitrate solution is kept in coloured bottles.
State the original colour of the following substance and colour of residue obtained after heating.
Ammonium dichromate
Write your observation and a balanced equation in the case of the following substances being heated.
Ammonium dichromate.
Give a suitable example with an equation to show the representation of a chemical reaction.
Explain with the help of balanced equations, how precipitation reactions are used for identifying the positive radicals in three different salts, each having a different cation [positive ion].
______ gas causes tears in our eyes while cutting onions.
What are the chemical reactions that occur in everyday life?
