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प्रश्न
Name the type of chemical reaction shown by the following equation:
Fe + CuSO4 → FeSO4 + Cu
उत्तर
Fe + CuSO4 → FeSO4 + Cu => Displacement reaction .
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संबंधित प्रश्न
How do the following help in bringing about a chemical change?
light.
Complete and balance the following chemical equations:
`"H"_2"S"` + `"CI"_2` `→`
Fill in the blanK
A .............is a substance which changes the rate of a chemical reaction without undergoing a chemical change.
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Which one of the following alters the rate of the chemical reaction without itself undergoing any change?
- temperature and Pressure
- concentration of reactants
- presence of catalyst
- 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.
State four conditions necessary for chemical reactions to take place.
Differentiate between in Chemical reaction and chemical equation.
Explain by writing a word equation.
Hard water gets softened on mixing with a solution of washing soda.
Match the pairs.
| a. | Photosynthesis | i. | Tendency to lose electrons |
| b. | Water | ii. | Reactant in combustion process |
| c. | Sodium chloride | iii. | Chemical change |
| d. | Dissolution of salt in water | iv. | Covalent bond |
| e. | Carbon | v. | Ionic bond |
| f. | Fluorine | vi. | Physical change |
| g. | Magnesium | vii. | Tendency to form anion |
Give an example of a reaction where the following are involved
Heat
Give an example of a reaction where the following are involved
Electricity
Give reason for the following:
Molybdenum is used in the manufacture of ammonia.
Complete the following table and write your observations.
|
Hydrogen sulphide |
Ammonia |
Sulphur dioxide |
Hydrogen chloride |
|
|
Shake the gas with red litmus solution |
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Shake the gas with blue litmus solution |
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|
Apply a burning splint to a gas |
State the original colour of the following substance and colour of residue obtained after heating.
Lead nitrate
Distinguish by dilute sulphuric acid.
Sodium Sulphite and sodium carbonate?
Select the correct answer for the following options:
The basic gas obtained when two gases react in presence of a catalyst and the reaction is exothermic.
Give reason for the following:
Electrolytic decomposition of water is a reaction involving change of state.
Complete the table given below.
| Heat on ammonium dichromate | Name of neutral gas evolved |
Complete the table given below.
| Flame test for calcium chloride | Acid used for flame test |
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 |
A chemical reaction is often accompanied by external indications or characteristics.
Explain with the help of balanced equations, how precipitation reactions are used for identifying the positive radicals in three different salts, each having a different cation [positive ion].
Complete the statement by filling in the blank with the correct word:
The reddish-brown precipitate obtained during a double decomposition precipitation reaction between an iron salt and alkali is __________.
What happens when cane sugar is strongly heated? Mention any two changes in it.
______ is not a chemical change.
Higher order Thinking question
Peeled and unpeeled banana does not look the same. Does that mean peeling banana is a chemical change?
Anaerobic bacteria digest animal waste and produce biogas (Change – A). The biogas is then burnt as fuel (Change – B). The following statements pertain to these changes. Choose the correct one.
The chemical name of baking soda is sodium bicarbonate.
