Mrignayani was doing the experiment of comparing

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Solution

Q.
Mrignayani was doing the experiment of comparing reactivity of metals in the laboratory. She was given aluminium metal and was told to check reactivity by using four solutions as shown below. She would observe that reaction takes place in:

1 A and B

2 B, C and D

3 A, C and D

4 C and D

Ans.
(2)

In the reactivity series, aluminium is above zinc, iron and copper, which makes it more reactive than these elements. Mrignayni would observe that out of the four solutions, reaction will take place in solution B, C and D. The reactions are as follows:

In Solution B: Aluminium will displace iron from ferrous sulphate solution to form aluminium sulphate and iron is precipitated.

$2 F e S O_{4} (a q) + 2 A l (s) \to A l_{2} {(S O_{4})}_{3} (a q) + 3 F e (s)$

In Solution C: Aluminium will displace zinc from zinc sulphate solution to form aluminium sulphate and zinc is precipitated.

$2 A l (s) + 3 Z n S O ₄ (a q) \to A l ₂ (S O ₄) ₃ (a q) + 3 Z n (s)$

In Solution D: Aluminium will displace copper from copper sulphate solution to form aluminium sulphate and copper is precipitated.

$2 A l (s) + 3 C u S O ₄ (a q) \to A l ₂ (S O ₄) ₃ (a q) + 3 C u (s)$

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