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प्रश्न
Give reason for the following:
A characteristic change of colour is seen when a piece of iron is added to copper [II] sulphate solution.
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उत्तर
A characteristic change of colour is seen when piece of iron is added to Copper (II) sulphate Solution. This is because iron displaces copper from the copper sulphate solution and forming ferrous sulphate
CuSO4 + Fe → FeSO4 + Cu.
Hence, Blue colour of the solution in changes to pale green and there is a reddish brown deposits on copper.
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संबंधित प्रश्न
Fill in the blanK
A .............is a substance which changes the rate of a chemical reaction without undergoing a chemical change.
Fill in the blank:
During a chemical reaction transfer of ________ takes place.
Name the type of chemical reaction shown by the following equation:
Fe + CuSO4 → FeSO4 + Cu
Give an example of a reaction where the following are involved:
Close contact
Give reason for the following:
Silver nitrate solution is kept in coloured bottles.
State the type of reactions for the following represent and balance the ones that are not balanced.
Cl2 + 2KBr → 2KCl + Br2
Multiple choice:
A reaction of a type: AB + CD → AD + CD, involves
Multiple choice:
Thermal decomposition of sodium carbonate will produce
Give an example of the following chemical changes.
A reaction where colour change is noticed.
Name: Two carbonates do not produce carbon dioxide on heating.
Complete the following table and write your observations.
|
Hydrogen sulphide |
Ammonia |
Sulphur dioxide |
Hydrogen chloride |
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|
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 |
Write your observation and a balanced equation in the case of the following substances being heated.
Copper nitrate.
Distinguish by dilute sulphuric acid.
Sodium Sulphite and sodium carbonate?
Select the correct answer for the following options:
The pale blue precipitated obtained when copper [II] sulphate reacts with sodium hydroxide.
Complete the table given below.
| Heat on ammonium dichromate | Name of neutral gas evolved |
________ is a chemical substance which alters the speed of a chemical reaction.
Mention the various conditions required for a chemical reaction to occur.
Give two examples for the following case:
Chemical changes
Explain how the painting of an iron gate prevents it from rusting.
Write a note on the following:
Curdling of milk
