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Question
Distinguish by heating the following in dry test tubs.
Zinc nitrate and copper nitrate.
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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RELATED QUESTIONS
Changes in which new substances are formed are called ______ changes.
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 \ FALSE
Ammonia is a good oxidizing agent.
How is a strong electrolyte different from a weak electrolyte?
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The substances which undergo chemical change are called _______
A chemical equation is a statement that describes a chemical change in terms of
Complete the statement by filling the gaps using appropriate term from the terms given in the bracket.
(slow, coloured, arrow, fast, smell, milky, physical, product, chemical, reactant, covalent, ionic, octet, duplet, exchange, sharing, equality sign)
The spoiling of food is a chemical change which is recognized from the generation of certain ______ due to it.
Explain the term reactant and product giving examples.
Write the chemical reaction where the following changes are observed.
Precipitate is formed
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.
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 FeS | Odour of gas evolved |
Photosynthesis is a chemical reaction that takes place in the presence of ______.
Discuss how acid rain occurs due to emission of smoke from vehicles and industries?
Silver metal can displace hydrogen gas from nitric acid.
The percentage composition of Nitrogen in Ureas is ______.
Give two examples for each of the following cases:
Chemical changes.
Explain how the painting of an iron gate prevents it from rusting.
Write a note on the catalyst.
Why is spoiling food a chemical change?
