The ore which is found in abundance in India is

The ore which is found in abundance in India is

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

2) The molecules of which gas have highest speed?

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

4) The main chemical constituent of clay is

5) Equal masses of oxygen, hydrogen and methane are kept under identical conditions. The ratio of the volumes of gases will be