The metal used to recover copper from a solution of copper sulphate is

The metal used to recover copper from a solution of copper sulphate is

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1) The number of atoms present in 21.6 gram of silver (atomic weight = 108) are same as the molecules in

2) The number of waves in n x 10^th Bohr's orbit are

3) The method of concentrating the ore which makes use of the difference in density between ore and impurities is called

4) The graphite rods in the nuclear reactor

5) The human body is made up of several chemical elements; the element present in the highest proportion (65%) in the body is