Advertisements
Advertisements
Question
A solution of a substance ‘X’ is used for white washing write the reaction of the substance ‘X’ named in (a) above with water.
Advertisements
Solution
\[\ce{\underset{\text{quick lime}}{CaO} + H2O ->\underset{\text{slaked lime}}{Ca(OH)2}}\]
APPEARS IN
RELATED QUESTIONS
When carbon dioxide is passed through lime water, it turns milky due to the formation of ______.
How do the following help in bringing about a chemical change?
heat.
FILL IN THE BLANK
On reaction with sulphuric acid solution, barium chloride forms a white precipitate of ........ sulphate.
Balance the following equation :
Fe + H2O → Fe3O4 + H2
Name the type of chemical reaction shown by the following equation:
2Mg + O2 → 2MgO
Give an example of a reaction where the following are involved:
Solution
Complete the following table and write your observations.
|
Hydrogen sulphide |
Ammonia |
Sulphur dioxide |
Hydrogen chloride |
|
|
Shake the gas with red litmus solution |
||||
|
Shake the gas with blue litmus solution |
||||
|
Apply a burning splint to a gas |
Name: A greenish-yellow gas.
State the original colour of the following substance and colour of residue obtained after heating.
Copper carbonate
Give a word equation for the following reaction.
A salt which reacts with ammonium hydroxide to give a reddish brown precipitate.
Differentiate between the following:
Neutralization reaction and a precipitation reaction.
Higher order Thinking question
A very hot glass on putting in cold water cracks. What does this change indicate?
Burning of paper is the best example of ______ change.
Match the following:
| 1. | Sodium Chloride | a. | CaSO41/2H2O |
| 2. | Calcium sulphate dihydrate | b. | C2H5Oh |
| 3. | Magnesium sulphate hydrate | c. | CaSO4.2H2O |
| 4. | Calcium sulphate hemihydrate | d. | NaCl |
| 5. | Phenol | e. | MgSO4.H2O |
Which of the following are chemical changes?
(i) Decaying of wood
(ii) Burning of wood
(iii) Sawing of wood
(iv) Hammering of a nail into a piece of wood
Vanaspati is obtained from vegetable oils by the addition of ______ to the oils.
Write the chemical reaction of baking soda with lemon.
What are the chemical reactions that occur in everyday life?
