Home
Class 12
CHEMISTRY
Iron nails are dipped into blue copper s...

Iron nails are dipped into blue copper sulphate solution.
After sometime iron nails are

A

dissolved and blue colour is discharged

B

dissolved but blue colour is not discharged

C

not dissolved and blue colour is not discharged

D

not dissolved but blue colour is discharged

Text Solution

AI Generated Solution

The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding the Reaction**: When iron nails are dipped into a blue copper sulfate solution (CuSO₄), a chemical reaction occurs due to the difference in reactivity between iron (Fe) and copper (Cu). 2. **Reactivity Series**: In the reactivity series of metals, iron is more reactive than copper. This means that iron can displace copper from its compounds. 3. **Displacement Reaction**: The reaction that takes place can be represented as: \[ \text{Fe} + \text{CuSO}_4 \rightarrow \text{FeSO}_4 + \text{Cu} \] Here, iron displaces copper from copper sulfate, forming iron(II) sulfate (FeSO₄) and depositing copper (Cu) as a solid. 4. **Observation**: After some time, the blue color of the copper sulfate solution will fade. This is because the copper ions (Cu²⁺) are being replaced by iron ions (Fe²⁺), which do not impart a blue color to the solution. 5. **Color Change of Iron Nails**: The iron nails will start to turn brown due to the deposition of copper on their surface. The iron itself does not dissolve in the solution; it remains solid. 6. **Conclusion**: Therefore, after some time, the iron nails will be coated with brown copper, and the blue color of the copper sulfate solution will gradually disappear. **Final Answer**: After some time, the iron nails will turn brown due to the deposition of copper, and the blue color of the copper sulfate solution will fade. ---
**Step-by-Step Solution:** 1. **Understanding the Reaction**: When iron nails are dipped into a blue copper sulfate solution (CuSO₄), a chemical reaction occurs due to the difference in reactivity between iron (Fe) and copper (Cu). 2. **Reactivity Series**: In the reactivity series of metals, iron is more reactive than copper. This means that iron can displace copper from its compounds. 3. **Displacement Reaction**: The reaction that takes place can be represented as: \[ ...
Promotional Banner

Similar Questions

Explore conceptually related problems

An iron nail was dropped into copper sulphate solution. After some time, the colour of the solution changed from :

You are given the following materials: (i) Iron nails (ii) Copper sulphate solution (iii) Barium chioride solution (iv) Copper powder (v) Ferrous sulphate crystals (vi) Quicklime Identify the type of chemical reaction taking place when: (a) Barium chloride solution is mixed with copper sulphate solution and a white precipitate is observed. (b) On heating copper powder in air in a china dish, the surface of copper powder turns black. (c) On heating green coloured ferrous sulphate crystals,reddish brown solid is left and smell of a gas having odour of burning sulphur is experienced. (d) Iron nails when left dipped in blue copper sulphate solution become brownish in colour and the blue colour of copper sulphate fades away. (e) Quick lime reacts vigorously with water releasing a large amount of heat. Write chemical equations for each one of the above reactions

State the reason for the following : An iron strip dipped in a blue copper sulphate solution turns the blue solution pale green.

An iron knife dipped in a blue copper sulphate solution turns the blue solution light green. Why ?

State the reason why (i) carbon is not used to reduce the oxides of sodium or aluminium. (ii) an iron strip dipped in a blue copper sulphate solution turns the blue solution to pale green. (iii) calcium does not occur free in nature. (iv) zinc is used in the galvanisation of iron and not copper.

State the reason why (i) carbon is not used to reduce the oxides of sodium or aluminium. (ii) an iron strip dipped in a blue copper sulphate solution turns the blue solution to pale green. (iii) calcium does not occur in free state in nature. (iv) zinc is used in the galvanisation of iron and not copper.