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 octane number of zero is assigned to

2) The following are the half lives of four active isotopes. Which one of the following is the most dangerous to handle?

3) The main chemical constituent of clay is

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

5) The nucleus of a hydrogen atom consists of