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Question
Distinguish by heating the following in dry test tubs.
Zinc nitrate and copper nitrate.
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Solution
| Zinc nitrate | Copper nitrate | |
| Residue left | Zinc oxide(ZnO) | Copper oxide(CuO) |
| Colour of residue | Yellow when hot and White when cold | Black Solid |
| Gas produced | The gas produced is Nitrogen dioxide and oxygen(NO2 + O2) | The gas produced is Nitrogen dioxide and oxygen(NO2 + O2) |
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In a double decomposition precipitation reaction both the reactants must be ............ soluble.
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 |
True or false
New substances are formed in a chemical change.
Name the type of chemical reaction shown by the following equation :
Fe2O3 + 2Al → Al2O3 + 2Fe
Explain the term reactant and product giving examples.
Write your observation and a balanced equation in the case of the following substances being heated.
Copper nitrate.
Write your observation and a balanced equation in the case of the following substances being heated.
Ammonium chloride
Give reason for the following:
The catalytic oxidation of sulphur dioxide to sulphur trioxide is represented by a double arrow {⇌}
between the reactants and products, formed in the chemical reaction.
Complete the table given below.
| Addition of dil. H2SO4 to KHCO3 | Name of residue obtained |
The water we drink is a combination of hydrogen and oxygen.
