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प्रश्न
A student added few pieces of aluminium metal to two test tubes A and B containing aqueous solutions of iron sulphate and copper sulphate. In the second part of her experiment, she added iron metal to another test tubes C and D containing aqueous solutions of aluminium sulphate and copper sulphate.
In which test tube or test tubes will she observe colour change? On the basis of this experiment, state which one is the most reactive metal and why.
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उत्तर
Test tube A : `Al + FeSO_4 -> Al_2(SO_4)_3 + Fe`
Iron sulphate is a green coloured solution. However, the resultant aluminium sulphate is colourless.
Test tube B : `Al + CuSO_4 -> Al_2 (SO_4)_3 + Cu`
Copper sulphate is a blue coloured solution. However, the resultant aluminium sulphate is colourless.
Test tube C: `Fe + Al_2(SO_4)_3 -> No reaction`
No reaction takes place here because aluminium is more reactive than iron.
Test Tube D : `Fe + CuSO_4 -> FeSO_4 + Cu`
Here, iron replaces copper and form ferrous sulphate which is a pale green coloured solution because iron is more reactive than copper.
Colour changes were observed in test tubes A, B and D.
Therefore, reactivity in decreasing order is: Al > Fe > Cu
Aluminium is the most reactive metal because it displaced both iron and copper from their compounds.
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संबंधित प्रश्न
Name the following:
Metals which forms an amphoteric oxide.
The solution of Aluminium sulphate in water is .....................
(a) Green
(b) Colourless
(c) Pink
(d) Blue
What type of oxides are formed when metals combine with oxygen? Explain with the help of an example.
Give one example, with equation, of the displacement of hydrogen by a metal from an acid.
Name two metals (other than zinc and iron) which can displace hydrogen from dilute hydrochloric acid?
Write the equation for the reaction of Aluminium with dilute hydrochloric acid.
Name the products formed. Also indicate the physical states of all the substances involved.
One of the following is not a neutral oxide. This is:
(a) CO
(b) H2O
(c) N2O
(d) Na2O
An element E forms an oxide E2O. An aqueous solution of E2O turns red litmus paper blue.
(a) What is the nature of the oxide E2O?
(b) State whether element E is a metal or a non-metal.
(c) Give one example of an element like E.
In nature, metal A is found in a free state while metal B is found in the form of its compounds. Which of these two will be nearer to the top of the activity series of metals?
If A, B, C, D, E, F, G, H, I, J and K represent metals in the decreasing order of their reactivity, which one of them is most likely to occur in a free state in nature?
