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 most extensive, commercially useful source of thorium as monazite sand occurs in India at

2) The number of g-molecule of oxygen in 6.02 x 10²⁴CO molecules is

3) The major constituent of air is

4) The metal does not give H₂ on treatment with dilute HCL is

5) The luster of a metal is due to