Four metals $A$ , $B$ , $C$ and $D$ are in turn added to the following solutions one by one. The observations made are tabulated below.
Metal Iron (II) sulphate Copper (II) sulphate Zinc sulphate Silver nitrate
A No reaction Displacement - -
B Displacement - No reaction -
C No reaction No reaction No reaction Displacement
D No reaction No reaction No reaction No reaction
Answer the following based on the above information :
(i) Which is the most reactive metal? Why?
(ii) What would be observed, if ' $B$ ' is added to a solution of Copper (II) sulphate and why?
(iii) Arrange the metals $A$ , $B$ , $C$ and $D$ in order of increasing reactivity.
(iv) Which one among $A$ , $B$ , $C$ and $D$ metals can be used to make containers that can be used to store any of the above solutions safely?

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Solution

(i) B is the most reactive metal as it has displaced the most reactive metal amongst the solutions i.e Fe of $F e S O_{4}$ .
(ii) If B is added to $C u S O_{4}$ solution than it will displace Cu because Fe is more reactive than Cu so the metal which can displace Fe can also displace Cu.
(iii) D < C < A < B.
(iv) Metal D can be used to make containers to store the solutions because it is the least reactive metal of all.

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Similar questions

(a)
Use the Table above to answer the following questions about metals A, B, C and D.

(i) Which is the most reactive metal?

\begin{matrix} M e t a l & I r o n (I I) s u l p h a t e & C o o p e r (I I) s u l p h a t e & Z i n c s u l p h a t e & S i l v e r n i t r a t e A . & N o r e a c t i o n & D i s p l a c e m e n t B . & D i s p l a c e m e n t & N o r e a c t i o n C . & N o r e a c t i o n & N o r e a c t i o n & N o r e a c t i o n & D i s p l a c e m e n t D . & N o r e a c t i o n & N o r e a c t i o n & N o r e a c t i o n & N o r e a c t i o n \end{matrix}

\begin{matrix} M e t a l & I r o n (I I) s u l p h a t e & C o p p e r (I I) s u l p h a t e & Z i n c s u l p h a t e & S i l v e r n i t r a t e A . & N o r e a c t i o n & D i s p l a c e m e n t B . & D i s p l a c e m e n t & N o r e a c t i o n C . & N o r e a c t i o n & N o r e a c t i o n & N o r e a c t i o n & D i s p l a c e m e n t D . & N o r e a c t i o n & N o r e a c t i o n & N o r e a c t i o n & N o r e a c t i o n \end{matrix}

Samples of four metals A, B, C and D were taken and added to the following solution one by one. The results obtained have been tabulated as follows.

Use the Table above to answer the following questions about metals A, B, C and D.

(i) Which is the most reactive metal?

(ii) What would you observe if B is added to a solution of copper (II) sulphate?

(iii) Arrange the metals A, B, C and D in the order of decreasing reactivity.

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