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प्रश्न
A solution of a substance ‘X’ is used for white washing Name the substance ‘X’ and write its formula.
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उत्तर
Calcium oxide CaO
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संबंधित प्रश्न
Give reason .
A person suffering from acidity is advised to take an antacid.
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Reduction reaction is the exact opposite of
- displacement reaction
- decomposition reaction
- oxidation reaction
- none of these
FILL IN THE BLANK
........... electrolytes dissociate completely in aqueous state and allow large amount of electricity to flow through it.
TRUE \ FALSE
Ammonia is a good oxidizing agent.
TRUE \ FALSE
Evaporation of water is a physical change. True or false ?
Fill in the blank:
The substances which undergo chemical change are called _______
Fill in the blank:
During a chemical reaction transfer of ________ takes place.
Explain the following reaction with one suitable example of Displacement reaction.
A solution of a substance ‘X’ is used for white washing write the reaction of the substance ‘X’ named in (a) above with water.
What is the reaction called when oxidation and reduction take place simultaneously? Explain with one example.
What do you observe? When
Barium chloride is added to sodium sulphate solution
Select the correct answer for the following options:
The gas which reacts with oxygen to give a neutral liquid.
Match the chemical reactions in List I with the appropriate answer in List II.
| List I | List II | ||
| 1. | \[\ce{XY⇌[heat]X + Y}\] | A: | Displacement reaction |
| 2. | \[\ce{XY->X + Y}\] | B: | Double decomposition |
| 3. | \[\ce{X+Y- + A+B^-->X+B- + A+Y-}\] | C: | Endothermic reaction |
| 4. | \[\ce{X + YZ->XZ + Y}\] | D: | Thermal dissociation |
| 5. | \[\ce{X + Y->[heat]XY -\Delta}\] | E: | Decomposition reaction |
Give a balanced equation for a reaction involving the evolution of gas on the addition of dilute acid to sodium sulphite.
Give a balanced equation for a reaction involving the evolution of gas on the addition of dilute acid to calcium carbonate.
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Ammonium dichromate.
Analogy:
H2O: Water:: NaCl: ______.
______ is a natural indicator.
How would you show that the settling of curd is a chemical change?
Write a note on the catalyst.
