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CBSE Class 10 Answered

<div>sir</div> <div>&nbsp; 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.<br /><br /> <table border="1"> <tbody> <tr align="center"> <td>Metal</td> <td>Iron (II) sulpate</td> <td>Copper (II) sulpate</td> <td>Zinc sulphate</td> <td>Silver nitrate</td> </tr> <tr align="center"> <td>A</td> <td>No reaction</td> <td>Displacement</td> <td>&nbsp;</td> <td>&nbsp;</td> </tr> <tr align="center"> <td>B</td> <td>Displacment</td> <td>&nbsp;</td> <td>No reaction</td> <td>&nbsp;</td> </tr> <tr align="center"> <td>C</td> <td>No reaction</td> <td>No reaction</td> <td>No reaction</td> <td>Displacemet</td> </tr> <tr align="center"> <td>D</td> <td>No reaction</td> <td>No reaction</td> <td>No reaction</td> <td>No reaction</td> </tr> </tbody> </table> Use the table above to answer the following questions about metals A, B, C and D. <br />(i) Which is the most reactive metal?<br />(ii) What would you observe when metal B is added to a solution of copper (II) sulphate?<br />(iii) Arrange the metals A, B, C and D in the order of decreasing reactivity.<strong></strong><em></em></div>
Asked by seeni2005 | 24 Jul, 2016, 03:50: PM
Expert Answer
From the given table we can write following observations:
1) A is less reactive than Fe but more reactive than Cu.
2) B is more reactive than Fe but less reactive than Zn.
3) C is more reactive than Ag but less reactive than Fe, Cu and Zn.
4) D is less reactive than Fe, Cu, Zn, Ag.
Hence we can conclude that,
(i) B is the most reactive metal.
(ii) B can displace Cu as B is more reactive than Cu.
(iii) The reactivity of these metals in the decreasing order is B > A > C > D.
 
Reactivity series,
 
Zn > B > Fe > A > Cu > C > Ag > D
Answered by Prachi Sawant | 24 Jul, 2016, 10:58: PM

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