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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
Fill in the blank
A catalyst either ................or ............... the rate of a chemical change but itself remains ............... at the end of the reaction.
TRUE \ FALSE
A precipitation reaction takes place only in a solution.
TRUE \ FALSE
Copper can displace iron from iron sulphate.
Write true or false :
When iron and sulphur are heated together a grey mass is formed which is attracted by a magnet .
Name: Two carbonates do not produce carbon dioxide on heating.
Name: A greenish-yellow gas.
Give a chemical test to distinguish between the following gases.
HCl and Cl2
Distinguish by heating the following in dry test tubs.
Copper Sulphate and copper carbonate
A chemical reaction is often accompanied by external indications or characteristics which include –
- Colour change
- Effervescence or gas evolved
- Evolution or absorption of heat
- Formation of a precipitate.
With reference to each of the above indications, state the external indication seen during – Addition of dilute acid to an active metal.
When carbon dioxide is passed through lime water ______.
