Advertisements
Advertisements
प्रश्न
Write the missing reactants and products and balance the equations.
\[\ce{KClO3 ->[heat]}\] ___________+ ____________
Advertisements
उत्तर
\[\ce{2KClO3 ->[heat] 2KCl + 3O2}\]
APPEARS IN
संबंधित प्रश्न
When baking soda is mixed with lemon juice, bubbles are formed with the evolution of a gas. What type of change is it? Explain.
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer
Which of the following is a reducing agent?
- oxygen
- chlorine
- hydrogen
- none of these
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Compounds, which in their molten state allow an electric current to pass through them are called
- electrolytes
- non-electrolytes
- non-conductors
- none of these
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
Copper can displace iron from iron sulphate.
Write true or false :
When potassium iodide solution is added to lead acetate solution a red precipitate is formed.
A chemical equation is a statement that describes a chemical change in terms of
State four conditions necessary for a chemical reaction to take place.
A solution of a substance ‘X’ is used for white washing Name the substance ‘X’ and write its formula.
Write the chemical reaction where the following changes are observed.
Precipitate is formed
Give a chemical test to distinguish between the following gases.
HCl and H2S
Distinguish by dilute sulphuric acid.
Sodium sulphide and sodium sulphite?
Give examples of exothermic reactions i.e. heat evolved in each of the following:
(a) reaction between a solid and a liquid
(b) reaction between two gases
Give two examples of exothermic reactions seen in everyday life.
A chemical reaction is often accompanied by external indications or characteristics.
When an aqueous solution of potassium chloride is added to an aqueous solution of silver nitrate, a white precipitate is formed. Give the chemical equation of this reaction.
Iron benches kept in lawns and gardens get____________. It is a _________ change because a new _________ is formed.
How can we prevent rusting?
Write a note on the following:
Curdling of milk
When milk is mixed with coffee decoction, the colour of milk and decoction changes due to ______.
What is the difference between reactants and products?
