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प्रश्न
What do you observe when iron nail is kept in copper sulphate solution for sometime.
What happens when an iron nail is dipped in copper (II) sulphate solution? Write balanced chemical equations to support your answer.
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उत्तर
When an iron nail is kept in copper sulphate solution, a reddish brown coating is seen on the iron nail after sometime. Also, the colour of the copper sulphate solution changes from blue to green. This is observed because iron displaces copper from copper sulphate solution, as iron is more reactive than copper.
\[\ce{Fe_{(s)} + CuSO4_{(aq)} -> FeSO4_{(aq)} + Cu_{(s)}}\]
संबंधित प्रश्न
Name three biochemical catalysts found in the human body.
Write the missing reactants and products and balance the equations.
NaOH + ............... `→` NaCI + ...................
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
FILL IN THE BLANK
In a double decomposition precipitation reaction both the reactants must be ............ soluble.
Fill in the blank:
The substances formed as a result of a chemical reaction are called _______
Write true or false :
Hydrogen sulphide has rotten egg smell .
Explain the following reaction with one suitable example of Combination reactions .
Match the column in the following table.
| Reactants | Products | Type of chemical reaction |
| BaCl2(aq) + ZnSO4(aq) | H2CO3(aq) | Displacement |
| 2AgCl(s) | FeSO4(aq) + Cu(s) | Combination |
| CuSO4(aq) + Fe(s) | BaSO4↓ + ZnCl2(aq) | Decomposition |
| H2O(l) + CO2(g) | 2Ag(s) + Cl2(g) | Double displacement |
Choose the correct option from the bracket and explain the statement giving a reason.
(Oxidation, displacement, electrolysis, reduction, zinc, copper, double displacement, decomposition)
Addition of an aqueous solution of ZnSO4 to an aqueous solution of BaCl2 is an example of ______ reaction.
What is a chemical reaction?
State the main characteristics of chemical reactions. Give at least one example in each case.
Give a chemical test to distinguish between the following gases.
CO2 and SO2
Distinguish by heating the following in dry test tubs.
Ammonium Chloride and iodine.
Give reason for the following:
The catalytic oxidation of sulphur dioxide to sulphur trioxide is represented by a double arrow {⇌}
between the reactants and products, formed in the chemical reaction.
Complete the table given below.
| Addition of dil. H2SO4 to FeS | Odour of gas evolved |
Write a note on the following:
Curdling of milk
Write the characteristics of chemical change.
______ is the chemical name of rust.
______ is the chemical name of slaked lime.
What is the difference between reactants and products?
