Advertisements
Advertisements
प्रश्न
When hydrogen burns in oxygen, water is formed; when electricity is passed through water, hydrogen and oxygen are given out. Name the type of chemical change involved in the two cases.
Advertisements
उत्तर
When hydrogen burns in oxygen, water is formed - Combination Reaction.
When electricity is passed through water, hydrogen and oxygen are given out - Decomposition Reaction.
APPEARS IN
संबंधित प्रश्न
Complete and balance the following chemical equations
NaCI + `AgNO_3` `→`
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 |
Write true or false .
A black residue is formed when sugar is heated .
Choose the correct option from the bracket and explain the statement giving reason.
(Oxidation, displacement, electrolysis, reduction, zinc, copper, double displacement, decomposition)
The conversion of ferrous sulphate to ferric sulphate is ______ reaction.
Give an example of the following chemical change.
Two solids combine to form a liquid
What is a chemical change? Give two examples of chemical change?
The changes in which new substance with new chemical properties are formed are ______.
Heat may evolve or be absorbed during a ______ change.
The chemical name of baking soda is sodium bicarbonate.
Chemical changes are important in our day-to-day life. Give examples.
